fix up want lineage view

AGENTS.md

@@ -40,6 +40,7 @@ This architecture provides compile-time correctness, observability through event
 - Compile time correctness is a super-power, and investment in it speeds up flywheel for development and user value.
 - **CLI/Service Interchangeability**: Both the CLI and service must produce identical artifacts (BEL events, logs, metrics, outputs) in the same locations. Users should be able to build with one interface and query/inspect results from the other seamlessly. This principle applies to all DataBuild operations, not just builds.
 - The BEL represents real things that happen: job run processes that are started or fail, requests from the user, dep misses, etc.
+- We focus on highly impactful tests anchored to stable interfaces. For instance, using BEL events to create valid application states to test orchestration logic via shared scenarios. This helps us keep a high ratio from "well tested functionality" to "test brittleness".
 
 ## Build & Test
 ```bash

databuild/build_event_log.rs

@@ -350,11 +350,13 @@ impl Clone for BuildEventLog<MemoryBELStorage> {
     }
 }
 
+#[cfg(test)]
 mod tests {
     mod sqlite_bel_storage {
         use crate::build_event_log::{BELStorage, BuildEventLog, SqliteBELStorage};
         use crate::build_state::BuildState;
         use crate::data_build_event::Event;
+        use crate::util::test_scenarios::default_originating_lifetime;
         use crate::{PartitionRef, WantCreateEventV1};
         use uuid::Uuid;
 
@@ -387,6 +389,7 @@ mod tests {
             e.partitions = vec![PartitionRef {
                 r#ref: "sqlite_partition_1234".to_string(),
             }];
+            e.lifetime = Some(default_originating_lifetime());
             let event_id = log
                 .append_event(&Event::WantCreateV1(e))
                 .expect("append_event failed");
@@ -430,14 +433,17 @@ mod tests {
 
             let mut e2 = WantCreateEventV1::default();
             e2.want_id = Uuid::new_v4().into();
+            e2.lifetime = Some(default_originating_lifetime());
             log.append_event(&Event::WantCreateV1(e2))
                 .expect("append_event failed");
             let mut e3 = WantCreateEventV1::default();
             e3.want_id = Uuid::new_v4().into();
+            e3.lifetime = Some(default_originating_lifetime());
             log.append_event(&Event::WantCreateV1(e3))
                 .expect("append_event failed");
             let mut e4 = WantCreateEventV1::default();
             e4.want_id = Uuid::new_v4().into();
+            e4.lifetime = Some(default_originating_lifetime());
             log.append_event(&Event::WantCreateV1(e4))
                 .expect("append_event failed");
 

databuild/build_state/event_handlers.rs

@@ -4,12 +4,12 @@
 //! returning derivative events to be appended to the BEL.
 
 use crate::data_build_event::Event;
-use crate::data_deps::{WantTimestamps, missing_deps_to_want_events};
-use crate::event_source::Source as EventSourceVariant;
+use crate::data_deps::missing_deps_to_want_events;
 use crate::job_run_state::{JobRun, JobRunWithState, QueuedState as JobQueuedState};
 use crate::partition_state::{BuildingPartitionRef, Partition};
 use crate::util::current_timestamp;
-use crate::want_state::{NewState as WantNewState, Want, WantWithState};
+use crate::want_create_event_v1::Lifetime;
+use crate::want_state::{NewState as WantNewState, Want, WantLifetime, WantWithState};
 use crate::{
     JobRunBufferEventV1, JobRunCancelEventV1, JobRunFailureEventV1, JobRunHeartbeatEventV1,
     JobRunMissingDepsEventV1, JobRunSuccessEventV1, PartitionRef, TaintCancelEventV1,
@@ -45,26 +45,22 @@ impl BuildState {
         // Create want in New state from event
         let want_new: WantWithState<WantNewState> = event.clone().into();
 
-        // Log creation with derivative vs user-created distinction
-        let is_derivative = if let Some(source) = &event.source {
-            if let Some(EventSourceVariant::JobTriggered(job_triggered)) = &source.source {
-                tracing::info!(
-                    want_id = %event.want_id,
-                    partitions = ?event.partitions.iter().map(|p| &p.r#ref).collect::<Vec<_>>(),
-                    source_job_run_id = %job_triggered.job_run_id,
-                    "Want created (derivative - auto-created due to missing dependency)"
-                );
-                true
-            } else {
-                false
-            }
+        // Log creation with derivative vs user-created distinction based on lifetime
+        let is_derivative = matches!(&event.lifetime, Some(Lifetime::Ephemeral(_)));
+
+        if let Some(Lifetime::Ephemeral(eph)) = &event.lifetime {
+            tracing::info!(
+                want_id = %event.want_id,
+                partitions = ?event.partitions.iter().map(|p| &p.r#ref).collect::<Vec<_>>(),
+                source_job_run_id = %eph.job_run_id,
+                "Want created (ephemeral - auto-created due to missing dependency)"
+            );
         } else {
             tracing::info!(
                 want_id = %event.want_id,
                 partitions = ?event.partitions.iter().map(|p| &p.r#ref).collect::<Vec<_>>(),
-                "Want created (user-requested)"
+                "Want created (originating - user-requested)"
             );
-            false
         };
 
         // Register this want with all its partitions (via inverted index)
@@ -175,17 +171,22 @@ impl BuildState {
 
         self.wants.insert(event.want_id.clone(), final_want);
 
-        // If this is a derivative want (triggered by a job's dep miss), transition impacted wants to UpstreamBuilding
-        if is_derivative {
-            if let Some(source) = &event.source {
-                if let Some(EventSourceVariant::JobTriggered(job_triggered)) = &source.source {
-                    self.handle_derivative_want_creation(
-                        &event.want_id,
-                        &event.partitions,
-                        &job_triggered.job_run_id,
-                    );
+        // If this is an ephemeral want (triggered by a job's dep miss):
+        // 1. Record the derivative want ID on the source job run
+        // 2. Transition impacted wants to UpstreamBuilding
+        if let Some(Lifetime::Ephemeral(eph)) = &event.lifetime {
+            // Add this want as a derivative of the source job run
+            if let Some(job_run) = self.job_runs.get_mut(&eph.job_run_id) {
+                if let JobRun::DepMiss(dep_miss) = job_run {
+                    dep_miss.add_derivative_want_id(&event.want_id);
                 }
             }
+
+            self.handle_derivative_want_creation(
+                &event.want_id,
+                &event.partitions,
+                &eph.job_run_id,
+            );
         }
 
         vec![]
@@ -242,7 +243,7 @@ impl BuildState {
         // Create job run in Queued state
         let queued: JobRunWithState<JobQueuedState> = event.clone().into();
 
-        // Transition wants to Building
+        // Transition wants to Building and track this job run on each want
         // Valid states when job buffer event arrives:
         // - Idle: First job starting for this want (normal case)
         // - Building: Another job already started for this want (multiple jobs can service same want)
@@ -255,7 +256,7 @@ impl BuildState {
                 wap.want_id
             ));
 
-            let transitioned = match want {
+            let mut transitioned = match want {
                 Want::New(new_want) => {
                     // Want was just created and hasn't fully sensed yet - transition to Building
                     // This can happen if want creation and job buffer happen in quick succession
@@ -287,6 +288,9 @@ impl BuildState {
                 }
             };
 
+            // Track this job run on the want for lineage
+            transitioned.add_job_run_id(&event.job_run_id);
+
             self.wants.insert(wap.want_id.clone(), transitioned);
         }
 
@@ -340,18 +344,51 @@ impl BuildState {
     }
 
     pub(crate) fn handle_job_run_success(&mut self, event: &JobRunSuccessEventV1) -> Vec<Event> {
+        use std::collections::BTreeMap;
+
         let job_run = self.job_runs.remove(&event.job_run_id).expect(&format!(
             "BUG: Job run {} must exist when success event received",
             event.job_run_id
         ));
 
+        // Resolve read partition UUIDs from the read_deps in the event
+        let mut read_partition_uuids: BTreeMap<String, String> = BTreeMap::new();
+        for read_dep in &event.read_deps {
+            for read_ref in &read_dep.read {
+                if let Some(uuid) = self.get_canonical_partition_uuid(&read_ref.r#ref) {
+                    read_partition_uuids.insert(read_ref.r#ref.clone(), uuid.to_string());
+                }
+            }
+        }
+
+        // Get the building partitions from the job run to resolve wrote_partition_uuids
+        let building_partitions = match &job_run {
+            JobRun::Running(running) => running.info.building_partitions.clone(),
+            _ => vec![],
+        };
+
+        // Resolve wrote partition UUIDs - these will be set when we transition partitions to Live
+        // For now, we compute them based on job_run_id (same logic as transition_partitions_to_live)
+        let mut wrote_partition_uuids: BTreeMap<String, String> = BTreeMap::new();
+        for pref in &building_partitions {
+            let uuid =
+                crate::partition_state::derive_partition_uuid(&event.job_run_id, &pref.r#ref);
+            wrote_partition_uuids.insert(pref.r#ref.clone(), uuid.to_string());
+        }
+
         let succeeded = match job_run {
             JobRun::Running(running) => {
                 tracing::info!(
                     job_run_id = %event.job_run_id,
+                    read_deps_count = event.read_deps.len(),
                     "JobRun: Running → Succeeded"
                 );
-                running.succeed(current_timestamp())
+                running.succeed(
+                    current_timestamp(),
+                    event.read_deps.clone(),
+                    read_partition_uuids.clone(),
+                    wrote_partition_uuids.clone(),
+                )
             }
             _ => {
                 panic!(
@@ -361,6 +398,34 @@ impl BuildState {
             }
         };
 
+        // Populate the consumer index from read_deps (using UUIDs for historical lineage)
+        // For each read partition UUID, record that the written partition UUIDs consumed it
+        for read_dep in &event.read_deps {
+            for read_ref in &read_dep.read {
+                // Look up the read partition's UUID
+                if let Some(read_uuid) = read_partition_uuids.get(&read_ref.r#ref) {
+                    if let Ok(read_uuid) = uuid::Uuid::parse_str(read_uuid) {
+                        let consumers = self
+                            .partition_consumers
+                            .entry(read_uuid)
+                            .or_insert_with(Vec::new);
+                        for impacted_ref in &read_dep.impacted {
+                            // Look up the impacted (output) partition's UUID
+                            if let Some(wrote_uuid) = wrote_partition_uuids.get(&impacted_ref.r#ref)
+                            {
+                                if let Ok(wrote_uuid) = uuid::Uuid::parse_str(wrote_uuid) {
+                                    let entry = (wrote_uuid, event.job_run_id.clone());
+                                    if !consumers.contains(&entry) {
+                                        consumers.push(entry);
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
         // Job run success is SOURCE of truth that partitions are live
         let newly_live_partitions = succeeded.get_completed_partitions();
 
@@ -514,15 +579,6 @@ impl BuildState {
             }
         };
 
-        // Infer data/SLA timestamps from servicing wants
-        let want_timestamps: WantTimestamps = dep_miss
-            .info
-            .servicing_wants
-            .iter()
-            .flat_map(|wap| self.get_want(&wap.want_id).map(|w| w.into()))
-            .reduce(|a: WantTimestamps, b: WantTimestamps| a.merge(b))
-            .expect("BUG: No servicing wants found");
-
         // Collect all missing deps into a flat list of partition refs
         let all_missing_deps: Vec<PartitionRef> = event
             .missing_deps
@@ -534,13 +590,11 @@ impl BuildState {
         let building_refs_to_reset = dep_miss.get_building_partitions_to_reset();
         self.transition_partitions_to_upstream_building(&building_refs_to_reset, all_missing_deps);
 
-        // Generate WantCreateV1 events for the missing dependencies
+        // Generate ephemeral WantCreateV1 events for the missing dependencies
         // These events will be returned and appended to the BEL by BuildEventLog.append_event()
-        let want_events = missing_deps_to_want_events(
-            dep_miss.get_missing_deps().to_vec(),
-            &event.job_run_id,
-            want_timestamps,
-        );
+        // Ephemeral wants delegate freshness decisions to their originating want via the job_run_id reference
+        let want_events =
+            missing_deps_to_want_events(dep_miss.get_missing_deps().to_vec(), &event.job_run_id);
 
         // Store the job run in DepMiss state so we can access the missing_deps later
         // When the derivative WantCreateV1 events get processed by handle_want_create(),
@@ -642,17 +696,22 @@ impl BuildState {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::{MissingDeps, WantAttributedPartitions};
 
     mod want {
         use super::*;
-        use crate::WantDetail;
+        use crate::want_create_event_v1::Lifetime;
+        use crate::{OriginatingLifetime, WantDetail};
 
         #[test]
         fn test_should_create_want() {
             let mut e = WantCreateEventV1::default();
             e.want_id = "1234".to_string();
             e.partitions = vec!["mypart".into()];
+            e.lifetime = Some(Lifetime::Originating(OriginatingLifetime {
+                data_timestamp: 1000,
+                ttl_seconds: 3600,
+                sla_seconds: 7200,
+            }));
 
             let mut state = BuildState::default();
             state.handle_event(&e.clone().into());
@@ -665,9 +724,12 @@ mod tests {
 
         #[test]
         fn test_should_cancel_want() {
+            use crate::util::test_scenarios::default_originating_lifetime;
+
             let mut e = WantCreateEventV1::default();
             e.want_id = "1234".to_string();
             e.partitions = vec!["mypart".into()];
+            e.lifetime = Some(default_originating_lifetime());
 
             let mut state = BuildState::default();
             state.handle_event(&e.clone().into());
@@ -686,133 +748,25 @@ mod tests {
 
         #[test]
         fn test_multihop_dependency_replay() {
-            use crate::{
-                JobRunBufferEventV1, JobRunHeartbeatEventV1, JobRunMissingDepsEventV1,
-                JobRunSuccessEventV1, MissingDeps, PartitionRef, WantAttributedPartitions,
-                WantCreateEventV1,
-            };
+            use crate::util::test_scenarios::multihop_scenario;
 
-            let mut state = BuildState::default();
-            let mut events = vec![];
-
-            // 1. Create want for data/beta
-            let beta_want_id = "beta-want".to_string();
-            let mut create_beta = WantCreateEventV1::default();
-            create_beta.want_id = beta_want_id.clone();
-            create_beta.partitions = vec![PartitionRef {
-                r#ref: "data/beta".to_string(),
-            }];
-            events.push(Event::WantCreateV1(create_beta));
-
-            // 2. Queue beta job (first attempt)
-            let beta_job_1_id = "beta-job-1".to_string();
-            let mut buffer_beta_1 = JobRunBufferEventV1::default();
-            buffer_beta_1.job_run_id = beta_job_1_id.clone();
-            buffer_beta_1.job_label = "//job_beta".to_string();
-            buffer_beta_1.want_attributed_partitions = vec![WantAttributedPartitions {
-                want_id: beta_want_id.clone(),
-                partitions: vec![PartitionRef {
-                    r#ref: "data/beta".to_string(),
-                }],
-            }];
-            buffer_beta_1.building_partitions = vec![PartitionRef {
-                r#ref: "data/beta".to_string(),
-            }];
-            events.push(Event::JobRunBufferV1(buffer_beta_1));
-
-            // 3. Beta job starts running
-            let mut heartbeat_beta_1 = JobRunHeartbeatEventV1::default();
-            heartbeat_beta_1.job_run_id = beta_job_1_id.clone();
-            events.push(Event::JobRunHeartbeatV1(heartbeat_beta_1));
-
-            // 4. Beta job reports missing dependency on data/alpha
-            let mut dep_miss_beta_1 = JobRunMissingDepsEventV1::default();
-            dep_miss_beta_1.job_run_id = beta_job_1_id.clone();
-            dep_miss_beta_1.missing_deps = vec![MissingDeps {
-                impacted: vec![PartitionRef {
-                    r#ref: "data/beta".to_string(),
-                }],
-                missing: vec![PartitionRef {
-                    r#ref: "data/alpha".to_string(),
-                }],
-            }];
-            events.push(Event::JobRunMissingDepsV1(dep_miss_beta_1));
-
-            // 5. Create derivative want for data/alpha
-            let alpha_want_id = "alpha-want".to_string();
-            let mut create_alpha = WantCreateEventV1::default();
-            create_alpha.want_id = alpha_want_id.clone();
-            create_alpha.partitions = vec![PartitionRef {
-                r#ref: "data/alpha".to_string(),
-            }];
-            events.push(Event::WantCreateV1(create_alpha));
-
-            // 6. Queue alpha job
-            let alpha_job_id = "alpha-job".to_string();
-            let mut buffer_alpha = JobRunBufferEventV1::default();
-            buffer_alpha.job_run_id = alpha_job_id.clone();
-            buffer_alpha.job_label = "//job_alpha".to_string();
-            buffer_alpha.want_attributed_partitions = vec![WantAttributedPartitions {
-                want_id: alpha_want_id.clone(),
-                partitions: vec![PartitionRef {
-                    r#ref: "data/alpha".to_string(),
-                }],
-            }];
-            buffer_alpha.building_partitions = vec![PartitionRef {
-                r#ref: "data/alpha".to_string(),
-            }];
-            events.push(Event::JobRunBufferV1(buffer_alpha));
-
-            // 7. Alpha job starts running
-            let mut heartbeat_alpha = JobRunHeartbeatEventV1::default();
-            heartbeat_alpha.job_run_id = alpha_job_id.clone();
-            events.push(Event::JobRunHeartbeatV1(heartbeat_alpha));
-
-            // 8. Alpha job succeeds
-            let mut success_alpha = JobRunSuccessEventV1::default();
-            success_alpha.job_run_id = alpha_job_id.clone();
-            events.push(Event::JobRunSuccessV1(success_alpha));
-
-            // 9. Queue beta job again (second attempt) - THIS IS THE CRITICAL MOMENT
-            let beta_job_2_id = "beta-job-2".to_string();
-            let mut buffer_beta_2 = JobRunBufferEventV1::default();
-            buffer_beta_2.job_run_id = beta_job_2_id.clone();
-            buffer_beta_2.job_label = "//job_beta".to_string();
-            buffer_beta_2.want_attributed_partitions = vec![WantAttributedPartitions {
-                want_id: beta_want_id.clone(),
-                partitions: vec![PartitionRef {
-                    r#ref: "data/beta".to_string(),
-                }],
-            }];
-            buffer_beta_2.building_partitions = vec![PartitionRef {
-                r#ref: "data/beta".to_string(),
-            }];
-            events.push(Event::JobRunBufferV1(buffer_beta_2));
-
-            // 10. Beta job starts running
-            let mut heartbeat_beta_2 = JobRunHeartbeatEventV1::default();
-            heartbeat_beta_2.job_run_id = beta_job_2_id.clone();
-            events.push(Event::JobRunHeartbeatV1(heartbeat_beta_2));
-
-            // 11. Beta job succeeds
-            let mut success_beta_2 = JobRunSuccessEventV1::default();
-            success_beta_2.job_run_id = beta_job_2_id.clone();
-            events.push(Event::JobRunSuccessV1(success_beta_2));
+            let (events, ids) = multihop_scenario();
 
             // Process all events - this simulates replay
+            let mut state = BuildState::default();
             for event in &events {
                 state.handle_event(event);
             }
 
             // Verify final state
-            let beta_want = state.get_want(&beta_want_id).unwrap();
+            let beta_want = state.get_want(&ids.beta_want_id).unwrap();
             assert_eq!(
                 beta_want.status,
                 Some(crate::WantStatusCode::WantSuccessful.into()),
                 "Beta want should be successful after multi-hop dependency resolution"
             );
 
-            let alpha_want = state.get_want(&alpha_want_id).unwrap();
+            let alpha_want = state.get_want(&ids.alpha_want_id).unwrap();
             assert_eq!(
                 alpha_want.status,
                 Some(crate::WantStatusCode::WantSuccessful.into()),
@@ -824,6 +778,7 @@ mod tests {
         /// This was the original bug that motivated the UUID refactor.
         #[test]
         fn test_concurrent_wants_same_partition() {
+            use crate::util::test_scenarios::default_originating_lifetime;
             use crate::{
                 JobRunBufferEventV1, JobRunHeartbeatEventV1, PartitionRef,
                 WantAttributedPartitions, WantCreateEventV1,
@@ -838,6 +793,7 @@ mod tests {
             create_want_1.partitions = vec![PartitionRef {
                 r#ref: "data/beta".to_string(),
             }];
+            create_want_1.lifetime = Some(default_originating_lifetime());
             state.handle_event(&Event::WantCreateV1(create_want_1));
 
             // Want 1 should be Idle (no partition exists yet)
@@ -855,6 +811,7 @@ mod tests {
             create_want_2.partitions = vec![PartitionRef {
                 r#ref: "data/beta".to_string(),
             }];
+            create_want_2.lifetime = Some(default_originating_lifetime());
             state.handle_event(&Event::WantCreateV1(create_want_2));
 
             // Want 2 should also be Idle
@@ -932,6 +889,7 @@ mod tests {
 
     mod partition_lifecycle {
         use super::*;
+        use crate::util::test_scenarios::default_originating_lifetime;
         use crate::{
             JobRunBufferEventV1, JobRunFailureEventV1, JobRunHeartbeatEventV1,
             JobRunMissingDepsEventV1, JobRunSuccessEventV1, MissingDeps, PartitionRef,
@@ -952,6 +910,7 @@ mod tests {
             create_beta.partitions = vec![PartitionRef {
                 r#ref: "data/beta".to_string(),
             }];
+            create_beta.lifetime = Some(default_originating_lifetime());
             state.handle_event(&Event::WantCreateV1(create_beta));
 
             // 2. Job buffers for beta
@@ -1082,6 +1041,7 @@ mod tests {
             create_beta.partitions = vec![PartitionRef {
                 r#ref: "data/beta".to_string(),
             }];
+            create_beta.lifetime = Some(default_originating_lifetime());
             state.handle_event(&Event::WantCreateV1(create_beta));
 
             // 2. First job buffers for beta (creates uuid-1)
@@ -1129,6 +1089,7 @@ mod tests {
             create_alpha.partitions = vec![PartitionRef {
                 r#ref: "data/alpha".to_string(),
             }];
+            create_alpha.lifetime = Some(default_originating_lifetime());
             state.handle_event(&Event::WantCreateV1(create_alpha));
 
             let alpha_job_id = "alpha-job".to_string();

databuild/build_state/mod.rs

@@ -61,6 +61,11 @@ pub struct BuildState {
     // Inverted indexes
     pub(crate) wants_for_partition: BTreeMap<String, Vec<String>>, // partition ref → want_ids
     pub(crate) downstream_waiting: BTreeMap<String, Vec<Uuid>>, // upstream ref → partition UUIDs waiting for it
+
+    // Consumer index for lineage queries: input_uuid → list of (output_uuid, job_run_id)
+    // Uses UUIDs (not refs) to preserve historical lineage across partition rebuilds
+    // Populated from read_deps on job success
+    pub(crate) partition_consumers: BTreeMap<Uuid, Vec<(Uuid, String)>>,
 }
 
 impl BuildState {
@@ -118,6 +123,15 @@ impl BuildState {
             .unwrap_or(&[])
     }
 
+    /// Get consumers for a partition UUID (downstream partitions that read this one)
+    /// Returns list of (output_uuid, job_run_id) tuples
+    pub fn get_partition_consumers(&self, uuid: &Uuid) -> &[(Uuid, String)] {
+        self.partition_consumers
+            .get(uuid)
+            .map(|v| v.as_slice())
+            .unwrap_or(&[])
+    }
+
     /// Register a want in the wants_for_partition inverted index
     pub(crate) fn register_want_for_partitions(
         &mut self,

databuild/build_state/queries.rs

@@ -2,10 +2,12 @@
 //!
 //! Read-only methods for accessing state (get_*, list_*) used by the API layer.
 
+use crate::util::{HasRelatedIds, RelatedIds};
 use crate::{
-    JobRunDetail, ListJobRunsRequest, ListJobRunsResponse, ListPartitionsRequest,
-    ListPartitionsResponse, ListTaintsRequest, ListTaintsResponse, ListWantsRequest,
-    ListWantsResponse, PartitionDetail, TaintDetail, WantDetail,
+    GetJobRunResponse, GetPartitionResponse, GetWantResponse, JobRunDetail, ListJobRunsRequest,
+    ListJobRunsResponse, ListPartitionsRequest, ListPartitionsResponse, ListTaintsRequest,
+    ListTaintsResponse, ListWantsRequest, ListWantsResponse, PartitionDetail, RelatedEntities,
+    TaintDetail, WantDetail,
 };
 use std::collections::BTreeMap;
 
@@ -13,7 +15,34 @@ use super::{BuildState, consts};
 
 impl BuildState {
     pub fn get_want(&self, want_id: &str) -> Option<WantDetail> {
-        self.wants.get(want_id).map(|w| w.to_detail())
+        self.wants.get(want_id).map(|w| {
+            let mut detail = w.to_detail();
+            // Populate job_runs and compute derivative_want_ids by traversing job runs.
+            //
+            // derivative_want_ids is computed at query time rather than maintained during
+            // event handling. The relationship flows: Want → JobRun → (dep-miss) → EphemeralWant
+            //
+            // - JobRun tracks which derivative wants it spawned (on DepMissState)
+            // - Want only tracks which job runs serviced it (job_run_ids)
+            // - At query time, we traverse: Want's job_run_ids → each JobRun's derivative_want_ids
+            //
+            // This keeps event handling simple (just update the job run) and keeps JobRun
+            // as the source of truth for derivative want relationships.
+            for job_run_id in &detail.job_run_ids {
+                if let Some(job_run) = self.job_runs.get(job_run_id) {
+                    let job_detail = job_run.to_detail();
+                    // Collect derivative want IDs
+                    for derivative_want_id in &job_detail.derivative_want_ids {
+                        if !detail.derivative_want_ids.contains(derivative_want_id) {
+                            detail.derivative_want_ids.push(derivative_want_id.clone());
+                        }
+                    }
+                    // Add full job run details
+                    detail.job_runs.push(job_detail);
+                }
+            }
+            detail
+        })
     }
 
     pub fn get_taint(&self, taint_id: &str) -> Option<TaintDetail> {
@@ -49,6 +78,7 @@ impl BuildState {
             match_count: self.wants.len() as u64,
             page,
             page_size,
+            index: None,
         }
     }
 
@@ -60,6 +90,7 @@ impl BuildState {
             match_count: self.wants.len() as u64,
             page,
             page_size,
+            index: None,
         }
     }
 
@@ -81,6 +112,7 @@ impl BuildState {
             match_count: self.canonical_partitions.len() as u64,
             page,
             page_size,
+            index: None,
         }
     }
 
@@ -102,6 +134,7 @@ impl BuildState {
             match_count: self.job_runs.len() as u64,
             page,
             page_size,
+            index: None,
         }
     }
 }
@@ -116,3 +149,214 @@ fn list_state_items<T: Clone>(map: &BTreeMap<String, T>, page: u64, page_size: u
         .cloned()
         .collect()
 }
+
+// ============================================================================
+// Response builders with RelatedEntities index
+// ============================================================================
+
+impl BuildState {
+    /// Resolve RelatedIds to a RelatedEntities index by looking up entities in BuildState.
+    /// This is the central method for building the index from collected IDs.
+    pub fn resolve_related_ids(&self, ids: &RelatedIds) -> RelatedEntities {
+        let mut index = RelatedEntities::default();
+
+        // Resolve partition refs
+        for partition_ref in &ids.partition_refs {
+            if !index.partitions.contains_key(partition_ref) {
+                if let Some(p) = self.get_canonical_partition(partition_ref) {
+                    index
+                        .partitions
+                        .insert(partition_ref.clone(), p.to_detail());
+                }
+            }
+        }
+
+        // Resolve partition UUIDs
+        for uuid in &ids.partition_uuids {
+            if let Some(p) = self.partitions_by_uuid.get(uuid) {
+                let detail = p.to_detail();
+                if let Some(ref pref) = detail.r#ref {
+                    if !index.partitions.contains_key(&pref.r#ref) {
+                        index.partitions.insert(pref.r#ref.clone(), detail);
+                    }
+                }
+            }
+        }
+
+        // Resolve job run IDs
+        for job_run_id in &ids.job_run_ids {
+            if !index.job_runs.contains_key(job_run_id) {
+                if let Some(jr) = self.job_runs.get(job_run_id) {
+                    index.job_runs.insert(job_run_id.clone(), jr.to_detail());
+                }
+            }
+        }
+
+        // Resolve want IDs
+        for want_id in &ids.want_ids {
+            if !index.wants.contains_key(want_id) {
+                if let Some(w) = self.wants.get(want_id) {
+                    index.wants.insert(want_id.clone(), w.to_detail());
+                }
+            }
+        }
+
+        index
+    }
+
+    /// Get a want with its related entities (job runs, partitions)
+    pub fn get_want_with_index(&self, want_id: &str) -> Option<GetWantResponse> {
+        let want = self.wants.get(want_id)?;
+        let want_detail = want.to_detail();
+        let ids = want.related_ids();
+        let index = self.resolve_related_ids(&ids);
+
+        Some(GetWantResponse {
+            data: Some(want_detail),
+            index: Some(index),
+        })
+    }
+
+    /// Get a partition with its related entities (builder job run, downstream consumers)
+    pub fn get_partition_with_index(&self, partition_ref: &str) -> Option<GetPartitionResponse> {
+        let partition = self.get_canonical_partition(partition_ref)?;
+        let partition_detail = partition.to_detail();
+
+        let mut ids = partition.related_ids();
+
+        // Add downstream consumers from the consumer index (not stored on partition)
+        let uuid = partition.uuid();
+        for (output_uuid, job_run_id) in self.get_partition_consumers(&uuid) {
+            if !ids.partition_uuids.contains(output_uuid) {
+                ids.partition_uuids.push(*output_uuid);
+            }
+            if !ids.job_run_ids.contains(job_run_id) {
+                ids.job_run_ids.push(job_run_id.clone());
+            }
+        }
+
+        // Add wants that reference this partition (from inverted index)
+        for want_id in self.get_wants_for_partition(partition_ref) {
+            if !ids.want_ids.contains(want_id) {
+                ids.want_ids.push(want_id.clone());
+            }
+        }
+
+        let index = self.resolve_related_ids(&ids);
+
+        Some(GetPartitionResponse {
+            data: Some(partition_detail),
+            index: Some(index),
+        })
+    }
+
+    /// Get a job run with its related entities (read/wrote partitions, derivative wants)
+    pub fn get_job_run_with_index(&self, job_run_id: &str) -> Option<GetJobRunResponse> {
+        let job_run = self.job_runs.get(job_run_id)?;
+        let job_run_detail = job_run.to_detail();
+        let ids = job_run.related_ids();
+        let index = self.resolve_related_ids(&ids);
+
+        Some(GetJobRunResponse {
+            data: Some(job_run_detail),
+            index: Some(index),
+        })
+    }
+
+    /// List wants with related entities index
+    pub fn list_wants_with_index(&self, request: &ListWantsRequest) -> ListWantsResponse {
+        let page = request.page.unwrap_or(0);
+        let page_size = request.page_size.unwrap_or(consts::DEFAULT_PAGE_SIZE);
+        let start = page * page_size;
+
+        let wants: Vec<_> = self
+            .wants
+            .values()
+            .skip(start as usize)
+            .take(page_size as usize)
+            .collect();
+
+        // Collect related IDs from all wants
+        let mut all_ids = RelatedIds::default();
+        for want in &wants {
+            all_ids.merge(want.related_ids());
+        }
+
+        let data: Vec<WantDetail> = wants.iter().map(|w| w.to_detail()).collect();
+        let index = self.resolve_related_ids(&all_ids);
+
+        ListWantsResponse {
+            data,
+            match_count: self.wants.len() as u64,
+            page,
+            page_size,
+            index: Some(index),
+        }
+    }
+
+    /// List partitions with related entities index
+    pub fn list_partitions_with_index(
+        &self,
+        request: &ListPartitionsRequest,
+    ) -> ListPartitionsResponse {
+        let page = request.page.unwrap_or(0);
+        let page_size = request.page_size.unwrap_or(consts::DEFAULT_PAGE_SIZE);
+        let start = page * page_size;
+
+        let partitions: Vec<_> = self
+            .canonical_partitions
+            .iter()
+            .skip(start as usize)
+            .take(page_size as usize)
+            .filter_map(|(_, uuid)| self.partitions_by_uuid.get(uuid))
+            .collect();
+
+        // Collect related IDs from all partitions
+        let mut all_ids = RelatedIds::default();
+        for partition in &partitions {
+            all_ids.merge(partition.related_ids());
+        }
+
+        let data: Vec<PartitionDetail> = partitions.iter().map(|p| p.to_detail()).collect();
+        let index = self.resolve_related_ids(&all_ids);
+
+        ListPartitionsResponse {
+            data,
+            match_count: self.canonical_partitions.len() as u64,
+            page,
+            page_size,
+            index: Some(index),
+        }
+    }
+
+    /// List job runs with related entities index
+    pub fn list_job_runs_with_index(&self, request: &ListJobRunsRequest) -> ListJobRunsResponse {
+        let page = request.page.unwrap_or(0);
+        let page_size = request.page_size.unwrap_or(consts::DEFAULT_PAGE_SIZE);
+        let start = page * page_size;
+
+        let job_runs: Vec<_> = self
+            .job_runs
+            .values()
+            .skip(start as usize)
+            .take(page_size as usize)
+            .collect();
+
+        // Collect related IDs from all job runs
+        let mut all_ids = RelatedIds::default();
+        for job_run in &job_runs {
+            all_ids.merge(job_run.related_ids());
+        }
+
+        let data: Vec<JobRunDetail> = job_runs.iter().map(|jr| jr.to_detail()).collect();
+        let index = self.resolve_related_ids(&all_ids);
+
+        ListJobRunsResponse {
+            data,
+            match_count: self.job_runs.len() as u64,
+            page,
+            page_size,
+            index: Some(index),
+        }
+    }
+}

databuild/data_deps.rs

@@ -1,7 +1,7 @@
 use crate::data_build_event::Event;
+use crate::want_create_event_v1::Lifetime;
 use crate::{
-    JobRunMissingDeps, JobRunReadDeps, JobTriggeredEvent, MissingDeps, ReadDeps, WantCreateEventV1,
-    WantDetail,
+    EphemeralLifetime, JobRunMissingDeps, JobRunReadDeps, MissingDeps, ReadDeps, WantCreateEventV1,
 };
 use uuid::Uuid;
 
@@ -82,53 +82,19 @@ fn line_matches<'a>(line: &'a str, prefix: &'a str) -> Option<&'a str> {
     line.trim().strip_prefix(prefix)
 }
 
-pub struct WantTimestamps {
-    data_timestamp: u64,
-    ttl_seconds: u64,
-    sla_seconds: u64,
-}
-
-impl From<WantDetail> for WantTimestamps {
-    fn from(want_detail: WantDetail) -> Self {
-        WantTimestamps {
-            data_timestamp: want_detail.data_timestamp,
-            ttl_seconds: want_detail.ttl_seconds,
-            sla_seconds: want_detail.sla_seconds,
-        }
-    }
-}
-
-impl WantTimestamps {
-    pub fn merge(self, other: WantTimestamps) -> WantTimestamps {
-        // TODO does this make sense?
-        WantTimestamps {
-            data_timestamp: self.data_timestamp.min(other.data_timestamp),
-            ttl_seconds: self.ttl_seconds.max(other.ttl_seconds),
-            sla_seconds: self.sla_seconds.max(other.sla_seconds),
-        }
-    }
-}
-
-pub fn missing_deps_to_want_events(
-    missing_deps: Vec<MissingDeps>,
-    job_run_id: &String,
-    want_timestamps: WantTimestamps,
-) -> Vec<Event> {
+/// Create ephemeral want events from missing dependencies.
+/// Ephemeral wants are derivative wants created by the system when a job hits a dep-miss.
+/// They delegate freshness decisions to their originating want.
+pub fn missing_deps_to_want_events(missing_deps: Vec<MissingDeps>, job_run_id: &str) -> Vec<Event> {
     missing_deps
         .iter()
         .map(|md| {
             Event::WantCreateV1(WantCreateEventV1 {
                 want_id: Uuid::new_v4().into(),
                 partitions: md.missing.clone(),
-                data_timestamp: want_timestamps.data_timestamp,
-                ttl_seconds: want_timestamps.ttl_seconds,
-                sla_seconds: want_timestamps.sla_seconds,
-                source: Some(
-                    JobTriggeredEvent {
-                        job_run_id: job_run_id.clone(),
-                    }
-                    .into(),
-                ),
+                lifetime: Some(Lifetime::Ephemeral(EphemeralLifetime {
+                    job_run_id: job_run_id.to_string(),
+                })),
                 comment: Some("Missing data".to_string()),
             })
         })

databuild/databuild.proto

@@ -62,6 +62,20 @@ message JobTriggeredEvent {
   string job_run_id = 1;
 }
 
+// Want lifetime semantics
+// Originating wants are user-created with explicit freshness requirements
+message OriginatingLifetime {
+  uint64 data_timestamp = 1;
+  uint64 ttl_seconds = 2;
+  uint64 sla_seconds = 3;
+}
+// Ephemeral wants are system-created (derivative) from dep-miss
+// They delegate freshness decisions to their originating want
+message EphemeralLifetime {
+  // The job run that hit dep-miss and created this derivative want
+  string job_run_id = 1;
+}
+
 message WantAttributedPartitions {
   string want_id = 1;
   repeated PartitionRef partitions = 2;
@@ -85,9 +99,11 @@ message JobRunHeartbeatEventV1 {
   string job_run_id = 1;
   // TODO reentrance?
 }
-// Simply indicates that the job has succeeded.
+// Indicates that the job has succeeded, including what data was read.
 message JobRunSuccessEventV1 {
   string job_run_id = 1;
+  // The read dependencies for this job run, preserving impacted→read relationships
+  repeated ReadDeps read_deps = 2;
 }
 // Simply indicates that the job has failed. Depending on retry logic defined in job, it may retry.
 message JobRunFailureEventV1 {
@@ -134,12 +150,14 @@ message WantCreateEventV1 {
   // The unique ID of this want
   string want_id = 1;
   repeated PartitionRef partitions = 2;
-  uint64 data_timestamp = 3;
-  uint64 ttl_seconds = 4;
-  uint64 sla_seconds = 5;
-  // The source of the want. Can be from job, API, CLI, web app...
-  EventSource source = 6;
-  optional string comment = 7;
+
+  // Lifetime semantics - exactly one must be set
+  oneof lifetime {
+    OriginatingLifetime originating = 3;
+    EphemeralLifetime ephemeral = 4;
+  }
+
+  optional string comment = 5;
 }
 message WantCancelEventV1 {
   string want_id = 1;
@@ -205,14 +223,22 @@ message WantDetail {
   repeated PartitionRef partitions = 2;
   // The upstream partitions, detected from a dep miss job run failure
   repeated PartitionRef upstreams = 3;
-  uint64 data_timestamp = 4;
-  uint64 ttl_seconds = 5;
-  uint64 sla_seconds = 6;
-  EventSource source = 7;
-  optional string comment = 8;
-  WantStatus status = 9;
-  uint64 last_updated_timestamp = 10;
-  // TODO
+
+  // Lifetime semantics
+  oneof lifetime {
+    OriginatingLifetime originating = 4;
+    EphemeralLifetime ephemeral = 5;
+  }
+
+  optional string comment = 6;
+  WantStatus status = 7;
+  uint64 last_updated_timestamp = 8;
+  // Lineage: all job runs that have serviced this want (IDs for reference)
+  repeated string job_run_ids = 9;
+  // Lineage: derivative wants spawned by this want's job dep-misses (computed from job_run_ids)
+  repeated string derivative_want_ids = 10;
+  // Lineage: full details of job runs servicing this want (for display in tables)
+  repeated JobRunDetail job_runs = 11;
 }
 
 message PartitionDetail {
@@ -230,6 +256,11 @@ message PartitionDetail {
   // The unique identifier for this partition instance (UUID as string)
   // Each time a partition is built, it gets a new UUID derived from the job_run_id
   string uuid = 7;
+  // Lineage: job run that built this partition (for Live/Tainted partitions)
+  // Upstream lineage is resolved via this job run's read_deps (job run is source of truth)
+  optional string built_by_job_run_id = 8;
+  // Lineage: downstream partition UUIDs that consumed this (from consumer index)
+  repeated string downstream_partition_uuids = 9;
 }
 message PartitionStatus {
   PartitionStatusCode code = 1;
@@ -289,10 +320,31 @@ message JobRunDetail {
   optional uint64 last_heartbeat_at = 3;
   repeated PartitionRef building_partitions = 4;
   repeated WantAttributedPartitions servicing_wants = 5;
+  // Lineage: read dependencies with resolved UUIDs (for Succeeded jobs)
+  repeated ReadDeps read_deps = 6;
+  // Lineage: resolved UUIDs for read partitions (ref → UUID)
+  map<string, string> read_partition_uuids = 7;
+  // Lineage: resolved UUIDs for written partitions (ref → UUID)
+  map<string, string> wrote_partition_uuids = 8;
+  // Lineage: derivative wants spawned by this job's dep-miss (for DepMiss jobs)
+  repeated string derivative_want_ids = 9;
+  // Timestamps for tracking job lifecycle
+  optional uint64 queued_at = 10;
+  optional uint64 started_at = 11;
+  // The job label (e.g. "//path/to:job")
+  string job_label = 12;
 }
 
 
 
+// Related entities index - used in API responses for deduplication and O(1) lookup
+// Each entity appears once in the index, even if referenced by multiple items in `data`
+message RelatedEntities {
+  map<string, PartitionDetail> partitions = 1;
+  map<string, JobRunDetail> job_runs = 2;
+  map<string, WantDetail> wants = 3;
+}
+
 message EventFilter {
   // IDs of wants to get relevant events for
   repeated string want_ids = 1;
@@ -308,6 +360,7 @@ message ListWantsResponse {
   uint64 match_count = 2;
   uint64 page = 3;
   uint64 page_size = 4;
+  RelatedEntities index = 5;
 }
 
 message ListTaintsRequest {
@@ -320,6 +373,7 @@ message ListTaintsResponse {
   uint64 match_count = 2;
   uint64 page = 3;
   uint64 page_size = 4;
+  RelatedEntities index = 5;
 }
 
 message ListPartitionsRequest {
@@ -332,6 +386,7 @@ message ListPartitionsResponse {
   uint64 match_count = 2;
   uint64 page = 3;
   uint64 page_size = 4;
+  RelatedEntities index = 5;
 }
 
 message ListJobRunsRequest {
@@ -344,15 +399,16 @@ message ListJobRunsResponse {
   uint64 match_count = 2;
   uint64 page = 3;
   uint64 page_size = 4;
+  RelatedEntities index = 5;
 }
 
 message CreateWantRequest {
   repeated PartitionRef partitions = 1;
+  // User-created wants are always originating (have explicit freshness requirements)
   uint64 data_timestamp = 2;
   uint64 ttl_seconds = 3;
   uint64 sla_seconds = 4;
-  EventSource source = 5;
-  optional string comment = 6;
+  optional string comment = 5;
 }
 message CreateWantResponse {
   WantDetail data = 1;
@@ -372,6 +428,23 @@ message GetWantRequest {
 }
 message GetWantResponse {
   WantDetail data = 1;
+  RelatedEntities index = 2;
+}
+
+message GetPartitionRequest {
+  string partition_ref = 1;
+}
+message GetPartitionResponse {
+  PartitionDetail data = 1;
+  RelatedEntities index = 2;
+}
+
+message GetJobRunRequest {
+  string job_run_id = 1;
+}
+message GetJobRunResponse {
+  JobRunDetail data = 1;
+  RelatedEntities index = 2;
 }
 
 message CreateTaintRequest {

databuild/event_transforms.rs

@@ -1,14 +1,15 @@
 use crate::PartitionStatusCode::{PartitionFailed, PartitionLive};
 use crate::data_build_event::Event;
-use crate::job_run_state::{JobInfo, JobRunWithState, QueuedState};
+use crate::job_run_state::{JobInfo, JobRunWithState, QueuedState, TimingInfo};
 use crate::util::current_timestamp;
+use crate::want_create_event_v1::Lifetime;
 use crate::{
     CancelWantRequest, CancelWantResponse, CreateTaintRequest, CreateTaintResponse,
     CreateWantRequest, CreateWantResponse, EventSource, GetWantResponse, JobRunBufferEventV1,
     JobRunDetail, JobRunStatus, JobRunStatusCode, JobTriggeredEvent, ManuallyTriggeredEvent,
-    PartitionDetail, PartitionRef, PartitionStatus, PartitionStatusCode, TaintCancelEventV1,
-    TaintCreateEventV1, TaintDetail, WantAttributedPartitions, WantCancelEventV1,
-    WantCreateEventV1, WantDetail, WantStatus, WantStatusCode, event_source,
+    OriginatingLifetime, PartitionDetail, PartitionRef, PartitionStatus, PartitionStatusCode,
+    TaintCancelEventV1, TaintCreateEventV1, TaintDetail, WantAttributedPartitions,
+    WantCancelEventV1, WantCreateEventV1, WantDetail, WantStatus, WantStatusCode, event_source,
 };
 use uuid::Uuid;
 
@@ -19,17 +20,23 @@ impl From<&WantCreateEventV1> for WantDetail {
 }
 impl From<WantCreateEventV1> for WantDetail {
     fn from(e: WantCreateEventV1) -> Self {
+        // Convert want_create_event_v1::Lifetime to want_detail::Lifetime
+        let lifetime = e.lifetime.map(|l| match l {
+            Lifetime::Originating(orig) => crate::want_detail::Lifetime::Originating(orig),
+            Lifetime::Ephemeral(eph) => crate::want_detail::Lifetime::Ephemeral(eph),
+        });
+
         WantDetail {
             want_id: e.want_id,
             partitions: e.partitions,
             upstreams: vec![],
-            data_timestamp: e.data_timestamp,
-            ttl_seconds: e.ttl_seconds,
-            sla_seconds: e.sla_seconds,
-            source: e.source,
+            lifetime,
             comment: e.comment,
             status: Some(WantStatusCode::WantIdle.into()),
             last_updated_timestamp: current_timestamp(),
+            job_run_ids: vec![],
+            derivative_want_ids: vec![],
+            job_runs: vec![],
         }
     }
 }
@@ -74,27 +81,39 @@ impl From<WantStatusCode> for WantStatus {
 
 impl From<JobRunBufferEventV1> for JobRunDetail {
     fn from(value: JobRunBufferEventV1) -> Self {
+        use std::collections::HashMap;
         Self {
             id: value.job_run_id,
+            job_label: value.job_label,
             status: Some(JobRunStatusCode::JobRunQueued.into()),
             last_heartbeat_at: None,
             building_partitions: value.building_partitions,
             servicing_wants: value.want_attributed_partitions,
+            read_deps: vec![],
+            read_partition_uuids: HashMap::new(),
+            wrote_partition_uuids: HashMap::new(),
+            derivative_want_ids: vec![],
+            queued_at: Some(current_timestamp()),
+            started_at: None,
         }
     }
 }
 
 impl From<JobRunBufferEventV1> for JobRunWithState<QueuedState> {
     fn from(event: JobRunBufferEventV1) -> Self {
+        let queued_at = current_timestamp();
         JobRunWithState {
             info: JobInfo {
                 id: event.job_run_id,
+                job_label: event.job_label,
                 building_partitions: event.building_partitions,
                 servicing_wants: event.want_attributed_partitions,
             },
-            state: QueuedState {
-                queued_at: current_timestamp(),
+            timing: TimingInfo {
+                queued_at,
+                started_at: None,
             },
+            state: QueuedState { queued_at },
         }
     }
 }
@@ -190,13 +209,15 @@ impl From<&WantDetail> for WantAttributedPartitions {
 
 impl From<CreateWantRequest> for WantCreateEventV1 {
     fn from(value: CreateWantRequest) -> Self {
+        // User-created wants are always originating (have explicit freshness requirements)
         WantCreateEventV1 {
             want_id: Uuid::new_v4().into(),
             partitions: value.partitions,
-            data_timestamp: value.data_timestamp,
-            ttl_seconds: value.ttl_seconds,
-            sla_seconds: value.sla_seconds,
-            source: value.source,
+            lifetime: Some(Lifetime::Originating(OriginatingLifetime {
+                data_timestamp: value.data_timestamp,
+                ttl_seconds: value.ttl_seconds,
+                sla_seconds: value.sla_seconds,
+            })),
             comment: value.comment,
         }
     }
@@ -210,7 +231,10 @@ impl Into<CreateWantResponse> for Option<WantDetail> {
 
 impl Into<GetWantResponse> for Option<WantDetail> {
     fn into(self) -> GetWantResponse {
-        GetWantResponse { data: self }
+        GetWantResponse {
+            data: self,
+            index: None,
+        }
     }
 }
 

databuild/http_server.rs

@@ -2,7 +2,7 @@ use crate::build_event_log::BELStorage;
 use crate::build_state::BuildState;
 use crate::commands::Command;
 use crate::web::templates::{
-    BaseContext, HomePage, JobRunDetailPage, JobRunDetailView, JobRunsListPage,
+    BaseContext, DerivativeWantView, HomePage, JobRunDetailPage, JobRunDetailView, JobRunsListPage,
     PartitionDetailPage, PartitionDetailView, PartitionsListPage, WantCreatePage, WantDetailPage,
     WantDetailView, WantsListPage,
 };
@@ -260,9 +260,17 @@ async fn want_detail_page(
 
     match build_state.get_want(&want_id) {
         Some(want) => {
+            // Fetch derivative wants
+            let derivative_wants: Vec<_> = want
+                .derivative_want_ids
+                .iter()
+                .filter_map(|id| build_state.get_want(id))
+                .map(|w| DerivativeWantView::from(&w))
+                .collect();
+
             let template = WantDetailPage {
                 base: BaseContext::default(),
-                want: WantDetailView::from(want),
+                want: WantDetailView::new(&want, derivative_wants),
             };
             match template.render() {
                 Ok(html) => Html(html).into_response(),
@@ -433,7 +441,7 @@ async fn list_wants_json(
                 .into_response();
         }
     };
-    let response = build_state.list_wants(&params);
+    let response = build_state.list_wants_with_index(&params);
 
     (StatusCode::OK, Json(response)).into_response()
 }
@@ -456,10 +464,8 @@ async fn get_want_json(
                 .into_response();
         }
     };
-    let response = build_state.get_want(&want_id);
-
-    match response {
-        Some(want) => (StatusCode::OK, Json(GetWantResponse { data: Some(want) })).into_response(),
+    match build_state.get_want_with_index(&want_id) {
+        Some(response) => (StatusCode::OK, Json(response)).into_response(),
         None => {
             tracing::debug!("Want not found: {}", want_id);
             (
@@ -608,7 +614,7 @@ async fn list_partitions_json(
                 .into_response();
         }
     };
-    let response = build_state.list_partitions(&params);
+    let response = build_state.list_partitions_with_index(&params);
 
     (StatusCode::OK, Json(response)).into_response()
 }
@@ -631,7 +637,7 @@ async fn list_job_runs_json(
                 .into_response();
         }
     };
-    let response = build_state.list_job_runs(&params);
+    let response = build_state.list_job_runs_with_index(&params);
 
     (StatusCode::OK, Json(response)).into_response()
 }

databuild/job_run.rs

@@ -256,6 +256,7 @@ impl SubProcessCompleted {
     pub fn to_event(&self, job_run_id: &Uuid) -> Event {
         Event::JobRunSuccessV1(JobRunSuccessEventV1 {
             job_run_id: job_run_id.to_string(),
+            read_deps: self.read_deps.clone(),
         })
     }
 }
@@ -394,6 +395,7 @@ impl ToEvent for SubProcessCompleted {
     fn to_event(&self, job_run_id: &Uuid) -> Event {
         Event::JobRunSuccessV1(JobRunSuccessEventV1 {
             job_run_id: job_run_id.to_string(),
+            read_deps: self.read_deps.clone(),
         })
     }
 }

databuild/job_run_state.rs

@@ -1,9 +1,11 @@
 use crate::partition_state::{BuildingPartitionRef, FailedPartitionRef, LivePartitionRef};
-use crate::util::current_timestamp;
+use crate::util::{HasRelatedIds, RelatedIds, current_timestamp};
 use crate::{
     EventSource, JobRunDetail, JobRunStatusCode, MissingDeps, PartitionRef, ReadDeps,
     WantAttributedPartitions,
 };
+use std::collections::BTreeMap;
+use uuid::Uuid;
 
 /// State: Job has been queued but not yet started
 #[derive(Debug, Clone)]
@@ -22,6 +24,12 @@ pub struct RunningState {
 #[derive(Debug, Clone)]
 pub struct SucceededState {
     pub completed_at: u64,
+    /// The read dependencies reported by the job, preserving impacted→read relationships
+    pub read_deps: Vec<ReadDeps>,
+    /// Resolved UUIDs for partitions that were read (ref → UUID at read time)
+    pub read_partition_uuids: BTreeMap<String, String>,
+    /// Resolved UUIDs for partitions that were written (ref → UUID)
+    pub wrote_partition_uuids: BTreeMap<String, String>,
 }
 
 /// State: Job failed during execution
@@ -37,6 +45,8 @@ pub struct DepMissState {
     pub detected_at: u64,
     pub missing_deps: Vec<MissingDeps>,
     pub read_deps: Vec<ReadDeps>,
+    /// Want IDs of ephemeral wants spawned by this dep-miss
+    pub derivative_want_ids: Vec<String>,
 }
 
 /// State: Job was explicitly canceled
@@ -51,14 +61,25 @@ pub struct CanceledState {
 #[derive(Debug, Clone)]
 pub struct JobInfo {
     pub id: String,
+    pub job_label: String,
     pub building_partitions: Vec<PartitionRef>,
     pub servicing_wants: Vec<WantAttributedPartitions>,
 }
 
+/// Timing information preserved across state transitions
+#[derive(Debug, Clone)]
+pub struct TimingInfo {
+    /// When the job was first queued
+    pub queued_at: u64,
+    /// When the job started running (None if still queued or canceled before starting)
+    pub started_at: Option<u64>,
+}
+
 /// Generic job run struct parameterized by state
 #[derive(Debug, Clone)]
 pub struct JobRunWithState<S> {
     pub info: JobInfo,
+    pub timing: TimingInfo,
     pub state: S,
 }
 
@@ -80,6 +101,10 @@ impl JobRunWithState<QueuedState> {
     pub fn start_running(self, timestamp: u64) -> JobRunWithState<RunningState> {
         JobRunWithState {
             info: self.info,
+            timing: TimingInfo {
+                queued_at: self.timing.queued_at,
+                started_at: Some(timestamp),
+            },
             state: RunningState {
                 started_at: timestamp,
                 last_heartbeat_at: timestamp, // Initialize to start time
@@ -96,6 +121,7 @@ impl JobRunWithState<QueuedState> {
     ) -> JobRunWithState<CanceledState> {
         JobRunWithState {
             info: self.info,
+            timing: self.timing, // Preserve timing (started_at remains None)
             state: CanceledState {
                 canceled_at: timestamp,
                 source,
@@ -113,11 +139,21 @@ impl JobRunWithState<RunningState> {
     }
 
     /// Transition from Running to Succeeded
-    pub fn succeed(self, timestamp: u64) -> JobRunWithState<SucceededState> {
+    pub fn succeed(
+        self,
+        timestamp: u64,
+        read_deps: Vec<ReadDeps>,
+        read_partition_uuids: BTreeMap<String, String>,
+        wrote_partition_uuids: BTreeMap<String, String>,
+    ) -> JobRunWithState<SucceededState> {
         JobRunWithState {
             info: self.info,
+            timing: self.timing,
             state: SucceededState {
                 completed_at: timestamp,
+                read_deps,
+                read_partition_uuids,
+                wrote_partition_uuids,
             },
         }
     }
@@ -126,6 +162,7 @@ impl JobRunWithState<RunningState> {
     pub fn fail(self, timestamp: u64, reason: String) -> JobRunWithState<FailedState> {
         JobRunWithState {
             info: self.info,
+            timing: self.timing,
             state: FailedState {
                 failed_at: timestamp,
                 failure_reason: reason,
@@ -141,11 +178,13 @@ impl JobRunWithState<RunningState> {
         read_deps: Vec<ReadDeps>,
     ) -> JobRunWithState<DepMissState> {
         JobRunWithState {
+            timing: self.timing,
             info: self.info,
             state: DepMissState {
                 detected_at: timestamp,
                 missing_deps,
                 read_deps,
+                derivative_want_ids: vec![], // Populated later when ephemeral wants are created
             },
         }
     }
@@ -159,6 +198,7 @@ impl JobRunWithState<RunningState> {
     ) -> JobRunWithState<CanceledState> {
         JobRunWithState {
             info: self.info,
+            timing: self.timing,
             state: CanceledState {
                 canceled_at: timestamp,
                 source,
@@ -231,6 +271,21 @@ impl JobRunWithState<SucceededState> {
             .map(|p| LivePartitionRef(p.clone()))
             .collect()
     }
+
+    /// Get the read dependencies reported by the job
+    pub fn get_read_deps(&self) -> &[ReadDeps] {
+        &self.state.read_deps
+    }
+
+    /// Get the resolved UUIDs for partitions that were read
+    pub fn get_read_partition_uuids(&self) -> &BTreeMap<String, String> {
+        &self.state.read_partition_uuids
+    }
+
+    /// Get the resolved UUIDs for partitions that were written
+    pub fn get_wrote_partition_uuids(&self) -> &BTreeMap<String, String> {
+        &self.state.wrote_partition_uuids
+    }
 }
 
 impl JobRunWithState<FailedState> {
@@ -273,6 +328,17 @@ impl JobRunWithState<DepMissState> {
     pub fn get_read_deps(&self) -> &[ReadDeps] {
         &self.state.read_deps
     }
+
+    /// Add a derivative want ID (ephemeral want spawned by this dep-miss)
+    pub fn add_derivative_want_id(&mut self, want_id: &str) {
+        if !self
+            .state
+            .derivative_want_ids
+            .contains(&want_id.to_string())
+        {
+            self.state.derivative_want_ids.push(want_id.to_string());
+        }
+    }
 }
 
 impl JobRunWithState<CanceledState> {
@@ -290,52 +356,222 @@ impl JobRunWithState<CanceledState> {
     }
 }
 
+// ==================== HasRelatedIds trait implementation ====================
+
+impl HasRelatedIds for JobRun {
+    /// Get the IDs of all entities this job run references.
+    /// Note: derivative_want_ids come from BuildState, not from JobRun itself.
+    fn related_ids(&self) -> RelatedIds {
+        // Partition refs from building_partitions (all states have this)
+        let partition_refs: Vec<String> = match self {
+            JobRun::Queued(jr) => jr
+                .info
+                .building_partitions
+                .iter()
+                .map(|p| p.r#ref.clone())
+                .collect(),
+            JobRun::Running(jr) => jr
+                .info
+                .building_partitions
+                .iter()
+                .map(|p| p.r#ref.clone())
+                .collect(),
+            JobRun::Succeeded(jr) => jr
+                .info
+                .building_partitions
+                .iter()
+                .map(|p| p.r#ref.clone())
+                .collect(),
+            JobRun::Failed(jr) => jr
+                .info
+                .building_partitions
+                .iter()
+                .map(|p| p.r#ref.clone())
+                .collect(),
+            JobRun::DepMiss(jr) => jr
+                .info
+                .building_partitions
+                .iter()
+                .map(|p| p.r#ref.clone())
+                .collect(),
+            JobRun::Canceled(jr) => jr
+                .info
+                .building_partitions
+                .iter()
+                .map(|p| p.r#ref.clone())
+                .collect(),
+        };
+
+        // Partition UUIDs from read/write lineage (only Succeeded state has these)
+        let partition_uuids: Vec<Uuid> = match self {
+            JobRun::Succeeded(jr) => {
+                let mut uuids = Vec::new();
+                for uuid_str in jr.state.read_partition_uuids.values() {
+                    if let Ok(uuid) = Uuid::parse_str(uuid_str) {
+                        uuids.push(uuid);
+                    }
+                }
+                for uuid_str in jr.state.wrote_partition_uuids.values() {
+                    if let Ok(uuid) = Uuid::parse_str(uuid_str) {
+                        if !uuids.contains(&uuid) {
+                            uuids.push(uuid);
+                        }
+                    }
+                }
+                uuids
+            }
+            _ => vec![],
+        };
+
+        // Want IDs from servicing_wants (all states have this)
+        let want_ids: Vec<String> = match self {
+            JobRun::Queued(jr) => jr
+                .info
+                .servicing_wants
+                .iter()
+                .map(|w| w.want_id.clone())
+                .collect(),
+            JobRun::Running(jr) => jr
+                .info
+                .servicing_wants
+                .iter()
+                .map(|w| w.want_id.clone())
+                .collect(),
+            JobRun::Succeeded(jr) => jr
+                .info
+                .servicing_wants
+                .iter()
+                .map(|w| w.want_id.clone())
+                .collect(),
+            JobRun::Failed(jr) => jr
+                .info
+                .servicing_wants
+                .iter()
+                .map(|w| w.want_id.clone())
+                .collect(),
+            JobRun::DepMiss(jr) => jr
+                .info
+                .servicing_wants
+                .iter()
+                .map(|w| w.want_id.clone())
+                .collect(),
+            JobRun::Canceled(jr) => jr
+                .info
+                .servicing_wants
+                .iter()
+                .map(|w| w.want_id.clone())
+                .collect(),
+        };
+
+        RelatedIds {
+            partition_refs,
+            partition_uuids,
+            job_run_ids: vec![],
+            want_ids,
+        }
+    }
+}
+
 // ==================== Conversion to JobRunDetail for API ====================
 
 impl JobRun {
     pub fn to_detail(&self) -> JobRunDetail {
+        use std::collections::HashMap;
+
         match self {
             JobRun::Queued(queued) => JobRunDetail {
                 id: queued.info.id.clone(),
+                job_label: queued.info.job_label.clone(),
                 status: Some(JobRunStatusCode::JobRunQueued.into()),
                 last_heartbeat_at: None,
                 building_partitions: queued.info.building_partitions.clone(),
                 servicing_wants: queued.info.servicing_wants.clone(),
+                read_deps: vec![],
+                read_partition_uuids: HashMap::new(),
+                wrote_partition_uuids: HashMap::new(),
+                derivative_want_ids: vec![],
+                queued_at: Some(queued.timing.queued_at),
+                started_at: queued.timing.started_at,
             },
             JobRun::Running(running) => JobRunDetail {
                 id: running.info.id.clone(),
+                job_label: running.info.job_label.clone(),
                 status: Some(JobRunStatusCode::JobRunRunning.into()),
                 last_heartbeat_at: Some(running.state.last_heartbeat_at),
                 building_partitions: running.info.building_partitions.clone(),
                 servicing_wants: running.info.servicing_wants.clone(),
+                read_deps: vec![],
+                read_partition_uuids: HashMap::new(),
+                wrote_partition_uuids: HashMap::new(),
+                derivative_want_ids: vec![],
+                queued_at: Some(running.timing.queued_at),
+                started_at: running.timing.started_at,
             },
             JobRun::Succeeded(succeeded) => JobRunDetail {
                 id: succeeded.info.id.clone(),
+                job_label: succeeded.info.job_label.clone(),
                 status: Some(JobRunStatusCode::JobRunSucceeded.into()),
                 last_heartbeat_at: None,
                 building_partitions: succeeded.info.building_partitions.clone(),
                 servicing_wants: succeeded.info.servicing_wants.clone(),
+                read_deps: succeeded.state.read_deps.clone(),
+                read_partition_uuids: succeeded
+                    .state
+                    .read_partition_uuids
+                    .clone()
+                    .into_iter()
+                    .collect(),
+                wrote_partition_uuids: succeeded
+                    .state
+                    .wrote_partition_uuids
+                    .clone()
+                    .into_iter()
+                    .collect(),
+                derivative_want_ids: vec![],
+                queued_at: Some(succeeded.timing.queued_at),
+                started_at: succeeded.timing.started_at,
             },
             JobRun::Failed(failed) => JobRunDetail {
                 id: failed.info.id.clone(),
+                job_label: failed.info.job_label.clone(),
                 status: Some(JobRunStatusCode::JobRunFailed.into()),
                 last_heartbeat_at: None,
                 building_partitions: failed.info.building_partitions.clone(),
                 servicing_wants: failed.info.servicing_wants.clone(),
+                read_deps: vec![],
+                read_partition_uuids: HashMap::new(),
+                wrote_partition_uuids: HashMap::new(),
+                derivative_want_ids: vec![],
+                queued_at: Some(failed.timing.queued_at),
+                started_at: failed.timing.started_at,
             },
             JobRun::DepMiss(dep_miss) => JobRunDetail {
                 id: dep_miss.info.id.clone(),
+                job_label: dep_miss.info.job_label.clone(),
                 status: Some(JobRunStatusCode::JobRunDepMiss.into()),
                 last_heartbeat_at: None,
                 building_partitions: dep_miss.info.building_partitions.clone(),
                 servicing_wants: dep_miss.info.servicing_wants.clone(),
+                read_deps: dep_miss.state.read_deps.clone(),
+                read_partition_uuids: HashMap::new(),
+                wrote_partition_uuids: HashMap::new(),
+                derivative_want_ids: dep_miss.state.derivative_want_ids.clone(),
+                queued_at: Some(dep_miss.timing.queued_at),
+                started_at: dep_miss.timing.started_at,
             },
             JobRun::Canceled(canceled) => JobRunDetail {
                 id: canceled.info.id.clone(),
+                job_label: canceled.info.job_label.clone(),
                 status: Some(JobRunStatusCode::JobRunCanceled.into()),
                 last_heartbeat_at: None,
                 building_partitions: canceled.info.building_partitions.clone(),
                 servicing_wants: canceled.info.servicing_wants.clone(),
+                read_deps: vec![],
+                read_partition_uuids: HashMap::new(),
+                wrote_partition_uuids: HashMap::new(),
+                derivative_want_ids: vec![],
+                queued_at: Some(canceled.timing.queued_at),
+                started_at: canceled.timing.started_at,
             },
         }
     }

databuild/orchestrator.rs

@@ -459,12 +459,13 @@ impl<S: BELStorage + Debug> Orchestrator<S> {
 
 #[cfg(test)]
 mod tests {
-    use crate::WantCreateEventV1;
     use crate::build_event_log::MemoryBELStorage;
     use crate::job::JobConfiguration;
     use crate::mock_job_run::MockJobRun;
     use crate::orchestrator::{Orchestrator, OrchestratorConfig};
     use crate::util::current_timestamp;
+    use crate::want_create_event_v1::Lifetime;
+    use crate::{OriginatingLifetime, WantCreateEventV1};
     use uuid::Uuid;
 
     fn build_orchestrator() -> Orchestrator<MemoryBELStorage> {
@@ -477,10 +478,11 @@ mod tests {
             Self {
                 want_id: Uuid::new_v4().to_string(),
                 partitions: vec![],
-                data_timestamp: current_timestamp(),
-                ttl_seconds: 1000,
-                sla_seconds: 1000,
-                source: None,
+                lifetime: Some(Lifetime::Originating(OriginatingLifetime {
+                    data_timestamp: current_timestamp(),
+                    ttl_seconds: 1000,
+                    sla_seconds: 1000,
+                })),
                 comment: Some("test want".to_string()),
             }
         }
@@ -1045,7 +1047,8 @@ echo 'Beta succeeded'
     mod want_grouping {
         use super::super::*;
         use crate::build_event_log::MemoryBELStorage;
-        use crate::{PartitionRef, WantDetail};
+        use crate::want_detail::Lifetime;
+        use crate::{OriginatingLifetime, PartitionRef, WantDetail};
 
         fn create_job_config(label: &str, pattern: &str) -> JobConfiguration {
             JobConfiguration {
@@ -1066,13 +1069,17 @@ echo 'Beta succeeded'
                     })
                     .collect(),
                 upstreams: vec![],
-                data_timestamp: 0,
-                ttl_seconds: 0,
-                sla_seconds: 0,
-                source: None,
+                lifetime: Some(Lifetime::Originating(OriginatingLifetime {
+                    data_timestamp: 0,
+                    ttl_seconds: 0,
+                    sla_seconds: 0,
+                })),
                 comment: None,
                 status: None,
                 last_updated_timestamp: 0,
+                job_run_ids: vec![],
+                derivative_want_ids: vec![],
+                job_runs: vec![],
             }
         }
 

databuild/partition_state.rs

@@ -1,3 +1,4 @@
+use crate::util::{HasRelatedIds, RelatedIds};
 use crate::{PartitionDetail, PartitionRef, PartitionStatus, PartitionStatusCode};
 use serde::{Deserialize, Serialize};
 use sha2::{Digest, Sha256};
@@ -58,6 +59,8 @@ pub struct UpstreamFailedState {
 pub struct TaintedState {
     pub tainted_at: u64,
     pub taint_ids: Vec<String>,
+    /// Job run that originally built this partition (before it was tainted)
+    pub built_by: String,
 }
 
 /// Generic partition struct parameterized by state.
@@ -250,6 +253,7 @@ impl PartitionWithState<LiveState> {
             state: TaintedState {
                 tainted_at: timestamp,
                 taint_ids: vec![taint_id],
+                built_by: self.state.built_by,
             },
         }
     }
@@ -337,9 +341,57 @@ impl Partition {
     pub fn is_tainted(&self) -> bool {
         matches!(self, Partition::Tainted(_))
     }
+}
 
+// ==================== HasRelatedIds trait implementation ====================
+
+impl HasRelatedIds for Partition {
+    /// Get the IDs of all entities this partition references.
+    /// Note: downstream_partition_uuids and want_ids come from BuildState indexes,
+    /// not from Partition itself.
+    fn related_ids(&self) -> RelatedIds {
+        // Job run ID from the builder (for states that track it)
+        let job_run_ids: Vec<String> = match self {
+            Partition::Building(p) => vec![p.state.job_run_id.clone()],
+            Partition::UpstreamBuilding(p) => vec![p.state.job_run_id.clone()],
+            Partition::UpForRetry(p) => vec![p.state.original_job_run_id.clone()],
+            Partition::Live(p) => vec![p.state.built_by.clone()],
+            Partition::Failed(p) => vec![p.state.failed_by.clone()],
+            Partition::UpstreamFailed(_) => vec![],
+            Partition::Tainted(p) => vec![p.state.built_by.clone()],
+        };
+
+        // Partition refs from missing deps (for UpstreamBuilding state)
+        let partition_refs: Vec<String> = match self {
+            Partition::UpstreamBuilding(p) => p
+                .state
+                .missing_deps
+                .iter()
+                .map(|d| d.r#ref.clone())
+                .collect(),
+            Partition::UpstreamFailed(p) => p
+                .state
+                .failed_upstream_refs
+                .iter()
+                .map(|d| d.r#ref.clone())
+                .collect(),
+            _ => vec![],
+        };
+
+        RelatedIds {
+            partition_refs,
+            partition_uuids: vec![],
+            job_run_ids,
+            want_ids: vec![],
+        }
+    }
+}
+
+impl Partition {
     /// Convert to PartitionDetail for API responses and queries.
-    /// Note: want_ids is now empty - this will be populated by BuildState from the inverted index.
+    /// Note: want_ids and downstream_partition_uuids are empty here and will be
+    /// populated by BuildState from its inverted indexes.
+    /// Upstream lineage is resolved via built_by_job_run_id → job run's read_deps.
     pub fn to_detail(&self) -> PartitionDetail {
         match self {
             Partition::Building(p) => PartitionDetail {
@@ -353,6 +405,8 @@ impl Partition {
                 taint_ids: vec![],
                 last_updated_timestamp: None,
                 uuid: p.uuid.to_string(),
+                built_by_job_run_id: None,
+                downstream_partition_uuids: vec![], // Populated by BuildState
             },
             Partition::UpstreamBuilding(p) => PartitionDetail {
                 r#ref: Some(p.partition_ref.clone()),
@@ -365,6 +419,8 @@ impl Partition {
                 taint_ids: vec![],
                 last_updated_timestamp: None,
                 uuid: p.uuid.to_string(),
+                built_by_job_run_id: None,
+                downstream_partition_uuids: vec![], // Populated by BuildState
             },
             Partition::UpForRetry(p) => PartitionDetail {
                 r#ref: Some(p.partition_ref.clone()),
@@ -377,6 +433,8 @@ impl Partition {
                 taint_ids: vec![],
                 last_updated_timestamp: None,
                 uuid: p.uuid.to_string(),
+                built_by_job_run_id: None,
+                downstream_partition_uuids: vec![], // Populated by BuildState
             },
             Partition::Live(p) => PartitionDetail {
                 r#ref: Some(p.partition_ref.clone()),
@@ -389,6 +447,8 @@ impl Partition {
                 taint_ids: vec![],
                 last_updated_timestamp: Some(p.state.built_at),
                 uuid: p.uuid.to_string(),
+                built_by_job_run_id: Some(p.state.built_by.clone()),
+                downstream_partition_uuids: vec![], // Populated by BuildState
             },
             Partition::Failed(p) => PartitionDetail {
                 r#ref: Some(p.partition_ref.clone()),
@@ -401,6 +461,8 @@ impl Partition {
                 taint_ids: vec![],
                 last_updated_timestamp: Some(p.state.failed_at),
                 uuid: p.uuid.to_string(),
+                built_by_job_run_id: None,
+                downstream_partition_uuids: vec![], // Populated by BuildState
             },
             Partition::UpstreamFailed(p) => PartitionDetail {
                 r#ref: Some(p.partition_ref.clone()),
@@ -413,6 +475,8 @@ impl Partition {
                 taint_ids: vec![],
                 last_updated_timestamp: Some(p.state.failed_at),
                 uuid: p.uuid.to_string(),
+                built_by_job_run_id: None,
+                downstream_partition_uuids: vec![], // Populated by BuildState
             },
             Partition::Tainted(p) => PartitionDetail {
                 r#ref: Some(p.partition_ref.clone()),
@@ -421,10 +485,12 @@ impl Partition {
                     name: "PartitionTainted".to_string(),
                 }),
                 want_ids: vec![], // Populated by BuildState
-                job_run_ids: vec![],
+                job_run_ids: vec![p.state.built_by.clone()],
                 taint_ids: p.state.taint_ids.clone(),
                 last_updated_timestamp: Some(p.state.tainted_at),
                 uuid: p.uuid.to_string(),
+                built_by_job_run_id: Some(p.state.built_by.clone()),
+                downstream_partition_uuids: vec![], // Populated by BuildState
             },
         }
     }

databuild/util.rs

@@ -1,5 +1,57 @@
 use std::backtrace::Backtrace;
 use std::time::{SystemTime, UNIX_EPOCH};
+use uuid::Uuid;
+
+// ============================================================================
+// Related IDs - for building RelatedEntities index in API responses
+// ============================================================================
+
+/// IDs of related entities that an object references.
+/// Used by the query layer to build the RelatedEntities index for API responses.
+#[derive(Debug, Clone, Default)]
+pub struct RelatedIds {
+    /// Partition refs (e.g., from Want.partitions, JobRun.building_partitions)
+    pub partition_refs: Vec<String>,
+    /// Partition UUIDs (e.g., from read/write lineage, consumer index)
+    pub partition_uuids: Vec<Uuid>,
+    /// Job run IDs (e.g., from built_by, consumer jobs)
+    pub job_run_ids: Vec<String>,
+    /// Want IDs (e.g., derivative wants, upstream wants, servicing wants)
+    pub want_ids: Vec<String>,
+}
+
+impl RelatedIds {
+    /// Merge another RelatedIds into this one, deduplicating
+    pub fn merge(&mut self, other: RelatedIds) {
+        for r in other.partition_refs {
+            if !self.partition_refs.contains(&r) {
+                self.partition_refs.push(r);
+            }
+        }
+        for u in other.partition_uuids {
+            if !self.partition_uuids.contains(&u) {
+                self.partition_uuids.push(u);
+            }
+        }
+        for j in other.job_run_ids {
+            if !self.job_run_ids.contains(&j) {
+                self.job_run_ids.push(j);
+            }
+        }
+        for w in other.want_ids {
+            if !self.want_ids.contains(&w) {
+                self.want_ids.push(w);
+            }
+        }
+    }
+}
+
+/// Trait for entities that can report their related entity IDs.
+/// Used by the query layer to build RelatedEntities indexes for API responses.
+/// Implementing types: Want, JobRun, Partition
+pub trait HasRelatedIds {
+    fn related_ids(&self) -> RelatedIds;
+}
 
 pub fn current_timestamp() -> u64 {
     let now = SystemTime::now();
@@ -89,3 +141,192 @@ impl std::fmt::Display for DatabuildError {
         write!(f, "{}", self.msg)
     }
 }
+
+// ============================================================================
+// Test Scenarios - reusable BEL event sequences for testing
+// ============================================================================
+
+#[cfg(test)]
+pub mod test_scenarios {
+    use crate::data_build_event::Event;
+    use crate::want_create_event_v1::Lifetime;
+    use crate::{
+        EphemeralLifetime, JobRunBufferEventV1, JobRunHeartbeatEventV1, JobRunMissingDepsEventV1,
+        JobRunSuccessEventV1, MissingDeps, OriginatingLifetime, PartitionRef, ReadDeps,
+        WantAttributedPartitions, WantCreateEventV1,
+    };
+
+    /// Returns a default Originating lifetime for use in tests.
+    /// WantCreateEventV1 requires a lifetime to be set.
+    pub fn default_originating_lifetime() -> Lifetime {
+        Lifetime::Originating(OriginatingLifetime {
+            data_timestamp: 1000,
+            ttl_seconds: 3600,
+            sla_seconds: 7200,
+        })
+    }
+
+    /// IDs used in the multihop scenario for easy reference in tests
+    pub struct MultihopIds {
+        pub beta_want_id: String,
+        pub alpha_want_id: String,
+        pub beta_job_1_id: String,
+        pub beta_job_2_id: String,
+        pub alpha_job_id: String,
+    }
+
+    impl Default for MultihopIds {
+        fn default() -> Self {
+            Self {
+                beta_want_id: "beta-want".to_string(),
+                alpha_want_id: "alpha-want".to_string(),
+                beta_job_1_id: "beta-job-1".to_string(),
+                beta_job_2_id: "beta-job-2".to_string(),
+                alpha_job_id: "alpha-job".to_string(),
+            }
+        }
+    }
+
+    /// Creates a multihop dependency scenario:
+    /// 1. Want for data/beta is created
+    /// 2. Job beta-job-1 starts, discovers missing dep on data/alpha
+    /// 3. Derivative want for data/alpha is created
+    /// 4. Job alpha-job builds data/alpha successfully
+    /// 5. Job beta-job-2 retries and succeeds
+    ///
+    /// This exercises: want creation, job buffering, dep-miss, derivative wants,
+    /// job success with read_deps, and retry logic.
+    pub fn multihop_scenario() -> (Vec<Event>, MultihopIds) {
+        let ids = MultihopIds::default();
+        let mut events = vec![];
+
+        // 1. Create originating want for data/beta (user-requested)
+        events.push(Event::WantCreateV1(WantCreateEventV1 {
+            want_id: ids.beta_want_id.clone(),
+            partitions: vec![PartitionRef {
+                r#ref: "data/beta".to_string(),
+            }],
+            lifetime: Some(Lifetime::Originating(OriginatingLifetime {
+                data_timestamp: 1000,
+                ttl_seconds: 3600,
+                sla_seconds: 7200,
+            })),
+            comment: Some("User requested beta data".to_string()),
+        }));
+
+        // 2. Queue beta job (first attempt)
+        events.push(Event::JobRunBufferV1(JobRunBufferEventV1 {
+            job_run_id: ids.beta_job_1_id.clone(),
+            job_label: "//job_beta".to_string(),
+            want_attributed_partitions: vec![WantAttributedPartitions {
+                want_id: ids.beta_want_id.clone(),
+                partitions: vec![PartitionRef {
+                    r#ref: "data/beta".to_string(),
+                }],
+            }],
+            building_partitions: vec![PartitionRef {
+                r#ref: "data/beta".to_string(),
+            }],
+            ..Default::default()
+        }));
+
+        // 3. Beta job starts running
+        events.push(Event::JobRunHeartbeatV1(JobRunHeartbeatEventV1 {
+            job_run_id: ids.beta_job_1_id.clone(),
+            ..Default::default()
+        }));
+
+        // 4. Beta job reports missing dependency on data/alpha
+        events.push(Event::JobRunMissingDepsV1(JobRunMissingDepsEventV1 {
+            job_run_id: ids.beta_job_1_id.clone(),
+            missing_deps: vec![MissingDeps {
+                impacted: vec![PartitionRef {
+                    r#ref: "data/beta".to_string(),
+                }],
+                missing: vec![PartitionRef {
+                    r#ref: "data/alpha".to_string(),
+                }],
+            }],
+            ..Default::default()
+        }));
+
+        // 5. Create ephemeral want for data/alpha (derivative - created due to dep-miss)
+        events.push(Event::WantCreateV1(WantCreateEventV1 {
+            want_id: ids.alpha_want_id.clone(),
+            partitions: vec![PartitionRef {
+                r#ref: "data/alpha".to_string(),
+            }],
+            lifetime: Some(Lifetime::Ephemeral(EphemeralLifetime {
+                job_run_id: ids.beta_job_1_id.clone(),
+            })),
+            comment: Some("Missing data".to_string()),
+        }));
+
+        // 6. Queue alpha job
+        events.push(Event::JobRunBufferV1(JobRunBufferEventV1 {
+            job_run_id: ids.alpha_job_id.clone(),
+            job_label: "//job_alpha".to_string(),
+            want_attributed_partitions: vec![WantAttributedPartitions {
+                want_id: ids.alpha_want_id.clone(),
+                partitions: vec![PartitionRef {
+                    r#ref: "data/alpha".to_string(),
+                }],
+            }],
+            building_partitions: vec![PartitionRef {
+                r#ref: "data/alpha".to_string(),
+            }],
+            ..Default::default()
+        }));
+
+        // 7. Alpha job starts running
+        events.push(Event::JobRunHeartbeatV1(JobRunHeartbeatEventV1 {
+            job_run_id: ids.alpha_job_id.clone(),
+            ..Default::default()
+        }));
+
+        // 8. Alpha job succeeds (no read deps for leaf node)
+        events.push(Event::JobRunSuccessV1(JobRunSuccessEventV1 {
+            job_run_id: ids.alpha_job_id.clone(),
+            read_deps: vec![],
+            ..Default::default()
+        }));
+
+        // 9. Queue beta job again (second attempt - retry)
+        events.push(Event::JobRunBufferV1(JobRunBufferEventV1 {
+            job_run_id: ids.beta_job_2_id.clone(),
+            job_label: "//job_beta".to_string(),
+            want_attributed_partitions: vec![WantAttributedPartitions {
+                want_id: ids.beta_want_id.clone(),
+                partitions: vec![PartitionRef {
+                    r#ref: "data/beta".to_string(),
+                }],
+            }],
+            building_partitions: vec![PartitionRef {
+                r#ref: "data/beta".to_string(),
+            }],
+            ..Default::default()
+        }));
+
+        // 10. Beta job 2 starts running
+        events.push(Event::JobRunHeartbeatV1(JobRunHeartbeatEventV1 {
+            job_run_id: ids.beta_job_2_id.clone(),
+            ..Default::default()
+        }));
+
+        // 11. Beta job 2 succeeds with read_deps showing it read data/alpha
+        events.push(Event::JobRunSuccessV1(JobRunSuccessEventV1 {
+            job_run_id: ids.beta_job_2_id.clone(),
+            read_deps: vec![ReadDeps {
+                impacted: vec![PartitionRef {
+                    r#ref: "data/beta".to_string(),
+                }],
+                read: vec![PartitionRef {
+                    r#ref: "data/alpha".to_string(),
+                }],
+            }],
+            ..Default::default()
+        }));
+
+        (events, ids)
+    }
+}

databuild/want_state.rs

@@ -1,8 +1,31 @@
 use crate::partition_state::FailedPartitionRef;
-use crate::util::current_timestamp;
-use crate::{EventSource, PartitionRef, WantCreateEventV1, WantDetail, WantStatusCode};
+use crate::util::{HasRelatedIds, RelatedIds, current_timestamp};
+use crate::want_create_event_v1::Lifetime;
+use crate::want_detail::Lifetime as WantDetailLifetime;
+use crate::{
+    EphemeralLifetime, EventSource, OriginatingLifetime, PartitionRef, WantCreateEventV1,
+    WantDetail, WantStatusCode,
+};
 use serde::{Deserialize, Serialize};
-use uuid::Uuid;
+
+/// Want lifetime semantics - determines how freshness/TTL is evaluated
+#[derive(Debug, Clone)]
+pub enum WantLifetime {
+    /// User/API-created wants with explicit freshness requirements.
+    /// These drive ongoing rebuilds when partitions get tainted.
+    Originating {
+        data_timestamp: u64,
+        ttl_seconds: u64,
+        sla_seconds: u64,
+    },
+    /// System-created (derivative) wants from dep-miss.
+    /// Delegate freshness decisions to their originating want.
+    /// Complete when partitions become Live, never trigger independent rebuilds.
+    Ephemeral {
+        /// The job run that hit dep-miss and created this derivative want
+        job_run_id: String,
+    },
+}
 
 /// State: Want has just been created, state not yet determined by sensing partition states
 #[derive(Debug, Clone)]
@@ -57,12 +80,11 @@ pub struct CanceledState {
 pub struct WantInfo {
     pub want_id: String,
     pub partitions: Vec<PartitionRef>,
-    pub data_timestamp: u64,
-    pub ttl_seconds: u64,
-    pub sla_seconds: u64,
-    pub source: Option<EventSource>,
+    pub lifetime: WantLifetime,
     pub comment: Option<String>,
     pub last_updated_at: u64,
+    /// Job runs that have serviced this want (populated by handle_job_run_buffer)
+    pub job_run_ids: Vec<String>,
 }
 
 impl Default for WantInfo {
@@ -70,12 +92,14 @@ impl Default for WantInfo {
         Self {
             want_id: uuid::Uuid::new_v4().to_string(),
             partitions: vec![],
-            data_timestamp: 0,
-            ttl_seconds: 0,
-            sla_seconds: 0,
-            source: None,
+            lifetime: WantLifetime::Originating {
+                data_timestamp: 0,
+                ttl_seconds: 0,
+                sla_seconds: 0,
+            },
             comment: None,
             last_updated_at: 0,
+            job_run_ids: vec![],
         }
     }
 }
@@ -180,16 +204,26 @@ impl WantWithState<CanceledState> {
 // From impl for creating want from event - creates in New state for sensing
 impl From<WantCreateEventV1> for WantWithState<NewState> {
     fn from(event: WantCreateEventV1) -> Self {
+        let lifetime = match event.lifetime {
+            Some(Lifetime::Originating(orig)) => WantLifetime::Originating {
+                data_timestamp: orig.data_timestamp,
+                ttl_seconds: orig.ttl_seconds,
+                sla_seconds: orig.sla_seconds,
+            },
+            Some(Lifetime::Ephemeral(eph)) => WantLifetime::Ephemeral {
+                job_run_id: eph.job_run_id,
+            },
+            None => panic!("Unexpectedly empty want lifetime"),
+        };
+
         WantWithState {
             want: WantInfo {
                 want_id: event.want_id,
                 partitions: event.partitions,
-                data_timestamp: event.data_timestamp,
-                ttl_seconds: event.ttl_seconds,
-                sla_seconds: event.sla_seconds,
-                source: event.source,
+                lifetime,
                 comment: event.comment,
                 last_updated_at: current_timestamp(),
+                job_run_ids: vec![],
             },
             state: NewState {},
         }
@@ -464,33 +498,134 @@ impl WantWithState<UpstreamBuildingState> {
     }
 }
 
+// ==================== HasRelatedIds trait implementation ====================
+
+impl HasRelatedIds for Want {
+    /// Get the IDs of all entities this want references.
+    /// Note: job_run_ids come from inverted indexes in BuildState, not from Want itself.
+    fn related_ids(&self) -> RelatedIds {
+        let partition_refs = self
+            .want()
+            .partitions
+            .iter()
+            .map(|p| p.r#ref.clone())
+            .collect();
+
+        // Collect want IDs from state-specific relationships
+        let want_ids = match self {
+            Want::UpstreamBuilding(w) => w.state.upstream_want_ids.clone(),
+            Want::UpstreamFailed(w) => w.state.failed_wants.clone(),
+            _ => vec![],
+        };
+
+        RelatedIds {
+            partition_refs,
+            partition_uuids: vec![],
+            job_run_ids: vec![],
+            want_ids,
+        }
+    }
+}
+
 // Helper methods on the Want enum
 impl Want {
-    /// Create a new want in the Idle state
-    pub fn new(
+    /// Create a new originating want in the Idle state
+    pub fn new_originating(
         want_id: String,
         partitions: Vec<PartitionRef>,
         data_timestamp: u64,
         ttl_seconds: u64,
         sla_seconds: u64,
-        source: Option<EventSource>,
         comment: Option<String>,
     ) -> Self {
         Want::Idle(WantWithState {
             want: WantInfo {
                 want_id,
                 partitions,
-                data_timestamp,
-                ttl_seconds,
-                sla_seconds,
-                source,
+                lifetime: WantLifetime::Originating {
+                    data_timestamp,
+                    ttl_seconds,
+                    sla_seconds,
+                },
                 comment,
                 last_updated_at: current_timestamp(),
+                job_run_ids: vec![],
             },
             state: IdleState {},
         })
     }
 
+    /// Create a new ephemeral want in the Idle state (derivative from dep-miss)
+    pub fn new_ephemeral(
+        want_id: String,
+        partitions: Vec<PartitionRef>,
+        job_run_id: String,
+        comment: Option<String>,
+    ) -> Self {
+        Want::Idle(WantWithState {
+            want: WantInfo {
+                want_id,
+                partitions,
+                lifetime: WantLifetime::Ephemeral { job_run_id },
+                comment,
+                last_updated_at: current_timestamp(),
+                job_run_ids: vec![],
+            },
+            state: IdleState {},
+        })
+    }
+
+    /// Get the lifetime of this want
+    pub fn lifetime(&self) -> &WantLifetime {
+        &self.want().lifetime
+    }
+
+    /// Add a job run ID to this want's list of servicing job runs
+    pub fn add_job_run_id(&mut self, job_run_id: &str) {
+        match self {
+            Want::New(w) => {
+                if !w.want.job_run_ids.contains(&job_run_id.to_string()) {
+                    w.want.job_run_ids.push(job_run_id.to_string());
+                }
+            }
+            Want::Idle(w) => {
+                if !w.want.job_run_ids.contains(&job_run_id.to_string()) {
+                    w.want.job_run_ids.push(job_run_id.to_string());
+                }
+            }
+            Want::Building(w) => {
+                if !w.want.job_run_ids.contains(&job_run_id.to_string()) {
+                    w.want.job_run_ids.push(job_run_id.to_string());
+                }
+            }
+            Want::UpstreamBuilding(w) => {
+                if !w.want.job_run_ids.contains(&job_run_id.to_string()) {
+                    w.want.job_run_ids.push(job_run_id.to_string());
+                }
+            }
+            Want::Successful(w) => {
+                if !w.want.job_run_ids.contains(&job_run_id.to_string()) {
+                    w.want.job_run_ids.push(job_run_id.to_string());
+                }
+            }
+            Want::Failed(w) => {
+                if !w.want.job_run_ids.contains(&job_run_id.to_string()) {
+                    w.want.job_run_ids.push(job_run_id.to_string());
+                }
+            }
+            Want::UpstreamFailed(w) => {
+                if !w.want.job_run_ids.contains(&job_run_id.to_string()) {
+                    w.want.job_run_ids.push(job_run_id.to_string());
+                }
+            }
+            Want::Canceled(w) => {
+                if !w.want.job_run_ids.contains(&job_run_id.to_string()) {
+                    w.want.job_run_ids.push(job_run_id.to_string());
+                }
+            }
+        }
+    }
+
     /// Check if want is schedulable (Idle or UpstreamBuilding with satisfied upstreams)
     pub fn is_schedulable(&self) -> bool {
         match self {
@@ -522,16 +657,32 @@ impl Want {
         }
     }
 
-    /// Convert to WantDetail for API responses and queries
+    /// Convert to WantDetail for API responses and queries.
+    /// job_run_ids are returned from the Want itself.
+    /// derivative_want_ids are computed by traversing job runs (done by BuildState).
     pub fn to_detail(&self) -> WantDetail {
+        let lifetime = match &self.want().lifetime {
+            WantLifetime::Originating {
+                data_timestamp,
+                ttl_seconds,
+                sla_seconds,
+            } => Some(WantDetailLifetime::Originating(OriginatingLifetime {
+                data_timestamp: *data_timestamp,
+                ttl_seconds: *ttl_seconds,
+                sla_seconds: *sla_seconds,
+            })),
+            WantLifetime::Ephemeral { job_run_id } => {
+                Some(WantDetailLifetime::Ephemeral(EphemeralLifetime {
+                    job_run_id: job_run_id.clone(),
+                }))
+            }
+        };
+
         WantDetail {
             want_id: self.want().want_id.clone(),
             partitions: self.want().partitions.clone(),
             upstreams: vec![], // Upstreams are tracked via want relationships, not stored here
-            data_timestamp: self.want().data_timestamp,
-            ttl_seconds: self.want().ttl_seconds,
-            sla_seconds: self.want().sla_seconds,
-            source: self.want().source.clone(),
+            lifetime,
             comment: self.want().comment.clone(),
             last_updated_timestamp: self.want().last_updated_at,
             status: match self {
@@ -544,6 +695,9 @@ impl Want {
                 Want::UpstreamFailed(_) => Some(WantStatusCode::WantUpstreamFailed.into()),
                 Want::Canceled(_) => Some(WantStatusCode::WantCanceled.into()),
             },
+            job_run_ids: self.want().job_run_ids.clone(),
+            derivative_want_ids: vec![], // Computed by BuildState via job traversal
+            job_runs: vec![],            // Populated by BuildState.get_want()
         }
     }
 }

databuild/web/templates.rs

@@ -3,7 +3,7 @@
 use askama::Template;
 
 use crate::{
-    JobRunDetail, JobRunStatus, PartitionDetail, PartitionRef, PartitionStatus,
+    JobRunDetail, JobRunStatus, PartitionDetail, PartitionRef, PartitionStatus, ReadDeps,
     WantAttributedPartitions, WantDetail, WantStatus,
 };
 
@@ -73,39 +73,120 @@ impl From<&JobRunStatus> for JobRunStatusView {
     }
 }
 
-pub struct WantDetailView {
+/// Simple view for derivative wants in the want detail page
+pub struct DerivativeWantView {
     pub want_id: String,
     pub partitions: Vec<PartitionRefView>,
-    pub upstreams: Vec<PartitionRefView>,
-    pub data_timestamp: u64,
-    pub ttl_seconds: u64,
-    pub sla_seconds: u64,
-    pub comment: Option<String>,
-    pub comment_display: String,
     pub status: Option<WantStatusView>,
-    pub last_updated_timestamp: u64,
 }
 
-impl From<&WantDetail> for WantDetailView {
+impl From<&WantDetail> for DerivativeWantView {
     fn from(w: &WantDetail) -> Self {
         Self {
             want_id: w.want_id.clone(),
             partitions: w.partitions.iter().map(PartitionRefView::from).collect(),
-            upstreams: w.upstreams.iter().map(PartitionRefView::from).collect(),
-            data_timestamp: w.data_timestamp,
-            ttl_seconds: w.ttl_seconds,
-            sla_seconds: w.sla_seconds,
-            comment: w.comment.clone(),
-            comment_display: w.comment.as_deref().unwrap_or("-").to_string(),
             status: w.status.as_ref().map(WantStatusView::from),
-            last_updated_timestamp: w.last_updated_timestamp,
         }
     }
 }
 
+/// Enum representing the want lifetime type for templates
+pub enum WantLifetimeView {
+    Originating {
+        data_timestamp: u64,
+        ttl_seconds: u64,
+        sla_seconds: u64,
+    },
+    Ephemeral {
+        job_run_id: String,
+    },
+}
+
+pub struct WantDetailView {
+    pub want_id: String,
+    pub partitions: Vec<PartitionRefView>,
+    pub upstreams: Vec<PartitionRefView>,
+    pub lifetime: Option<WantLifetimeView>,
+    /// Convenience accessor for originating wants - returns data_timestamp or 0
+    pub data_timestamp: u64,
+    /// Convenience accessor for originating wants - returns ttl_seconds or 0
+    pub ttl_seconds: u64,
+    /// Convenience accessor for originating wants - returns sla_seconds or 0
+    pub sla_seconds: u64,
+    /// True if this is an ephemeral (derivative) want
+    pub is_ephemeral: bool,
+    /// Job run that created this ephemeral want (if ephemeral)
+    pub source_job_run_id: Option<String>,
+    pub comment: Option<String>,
+    pub comment_display: String,
+    pub status: Option<WantStatusView>,
+    pub last_updated_timestamp: u64,
+    // Lineage fields
+    pub job_run_ids: Vec<String>,
+    pub derivative_want_ids: Vec<String>,
+    pub job_runs: Vec<JobRunDetailView>,
+    pub derivative_wants: Vec<DerivativeWantView>,
+}
+
+impl WantDetailView {
+    /// Create a WantDetailView with derivative wants populated.
+    /// Use this for the detail page where derivative wants need to be shown.
+    pub fn new(w: &WantDetail, derivative_wants: Vec<DerivativeWantView>) -> Self {
+        use crate::want_detail::Lifetime;
+
+        let (lifetime, data_timestamp, ttl_seconds, sla_seconds, is_ephemeral, source_job_run_id) =
+            match &w.lifetime {
+                Some(Lifetime::Originating(orig)) => (
+                    Some(WantLifetimeView::Originating {
+                        data_timestamp: orig.data_timestamp,
+                        ttl_seconds: orig.ttl_seconds,
+                        sla_seconds: orig.sla_seconds,
+                    }),
+                    orig.data_timestamp,
+                    orig.ttl_seconds,
+                    orig.sla_seconds,
+                    false,
+                    None,
+                ),
+                Some(Lifetime::Ephemeral(eph)) => (
+                    Some(WantLifetimeView::Ephemeral {
+                        job_run_id: eph.job_run_id.clone(),
+                    }),
+                    0,
+                    0,
+                    0,
+                    true,
+                    Some(eph.job_run_id.clone()),
+                ),
+                None => (None, 0, 0, 0, false, None),
+            };
+
+        Self {
+            want_id: w.want_id.clone(),
+            partitions: w.partitions.iter().map(PartitionRefView::from).collect(),
+            upstreams: w.upstreams.iter().map(PartitionRefView::from).collect(),
+            lifetime,
+            data_timestamp,
+            ttl_seconds,
+            sla_seconds,
+            is_ephemeral,
+            source_job_run_id,
+            comment: w.comment.clone(),
+            comment_display: w.comment.as_deref().unwrap_or("-").to_string(),
+            status: w.status.as_ref().map(WantStatusView::from),
+            last_updated_timestamp: w.last_updated_timestamp,
+            job_run_ids: w.job_run_ids.clone(),
+            derivative_want_ids: w.derivative_want_ids.clone(),
+            job_runs: w.job_runs.iter().map(JobRunDetailView::from).collect(),
+            derivative_wants,
+        }
+    }
+}
+
+/// For list pages where derivative wants aren't needed
 impl From<WantDetail> for WantDetailView {
     fn from(w: WantDetail) -> Self {
-        Self::from(&w)
+        Self::new(&w, vec![])
     }
 }
 
@@ -119,6 +200,9 @@ pub struct PartitionDetailView {
     pub want_ids: Vec<String>,
     pub taint_ids: Vec<String>,
     pub uuid: String,
+    // Lineage fields
+    pub built_by_job_run_id: Option<String>,
+    pub downstream_partition_uuids: Vec<String>,
 }
 
 impl From<&PartitionDetail> for PartitionDetailView {
@@ -141,6 +225,8 @@ impl From<&PartitionDetail> for PartitionDetailView {
             want_ids: p.want_ids.clone(),
             taint_ids: p.taint_ids.clone(),
             uuid: p.uuid.clone(),
+            built_by_job_run_id: p.built_by_job_run_id.clone(),
+            downstream_partition_uuids: p.downstream_partition_uuids.clone(),
         }
     }
 }
@@ -165,20 +251,75 @@ impl From<&WantAttributedPartitions> for WantAttributedPartitionsView {
     }
 }
 
+/// View for read dependency entries (impacted → read relationships)
+pub struct ReadDepsView {
+    pub impacted: Vec<PartitionRefView>,
+    pub read: Vec<PartitionRefView>,
+}
+
+impl From<&ReadDeps> for ReadDepsView {
+    fn from(rd: &ReadDeps) -> Self {
+        Self {
+            impacted: rd.impacted.iter().map(PartitionRefView::from).collect(),
+            read: rd.read.iter().map(PartitionRefView::from).collect(),
+        }
+    }
+}
+
+/// View for partition ref with its resolved UUID (for lineage display)
+pub struct PartitionRefWithUuidView {
+    pub partition_ref: String,
+    pub partition_ref_encoded: String,
+    pub uuid: String,
+}
+
 pub struct JobRunDetailView {
     pub id: String,
+    pub job_label: String,
     pub status: Option<JobRunStatusView>,
     pub last_heartbeat_at: Option<u64>,
+    pub queued_at: Option<u64>,
+    pub started_at: Option<u64>,
     pub building_partitions: Vec<PartitionRefView>,
     pub servicing_wants: Vec<WantAttributedPartitionsView>,
+    // Lineage fields (populated for Succeeded/DepMiss states)
+    pub read_deps: Vec<ReadDepsView>,
+    pub read_partitions: Vec<PartitionRefWithUuidView>,
+    pub wrote_partitions: Vec<PartitionRefWithUuidView>,
+    pub derivative_want_ids: Vec<String>,
 }
 
 impl From<&JobRunDetail> for JobRunDetailView {
     fn from(jr: &JobRunDetail) -> Self {
+        // Build read_partitions from read_partition_uuids map
+        let read_partitions: Vec<PartitionRefWithUuidView> = jr
+            .read_partition_uuids
+            .iter()
+            .map(|(partition_ref, uuid)| PartitionRefWithUuidView {
+                partition_ref: partition_ref.clone(),
+                partition_ref_encoded: urlencoding::encode(partition_ref).into_owned(),
+                uuid: uuid.clone(),
+            })
+            .collect();
+
+        // Build wrote_partitions from wrote_partition_uuids map
+        let wrote_partitions: Vec<PartitionRefWithUuidView> = jr
+            .wrote_partition_uuids
+            .iter()
+            .map(|(partition_ref, uuid)| PartitionRefWithUuidView {
+                partition_ref: partition_ref.clone(),
+                partition_ref_encoded: urlencoding::encode(partition_ref).into_owned(),
+                uuid: uuid.clone(),
+            })
+            .collect();
+
         Self {
             id: jr.id.clone(),
+            job_label: jr.job_label.clone(),
             status: jr.status.as_ref().map(JobRunStatusView::from),
             last_heartbeat_at: jr.last_heartbeat_at,
+            queued_at: jr.queued_at,
+            started_at: jr.started_at,
             building_partitions: jr
                 .building_partitions
                 .iter()
@@ -189,6 +330,10 @@ impl From<&JobRunDetail> for JobRunDetailView {
                 .iter()
                 .map(WantAttributedPartitionsView::from)
                 .collect(),
+            read_deps: jr.read_deps.iter().map(ReadDepsView::from).collect(),
+            read_partitions,
+            wrote_partitions,
+            derivative_want_ids: jr.derivative_want_ids.clone(),
         }
     }
 }
@@ -361,3 +506,100 @@ pub struct JobRunDetailPage {
 pub struct WantCreatePage {
     pub base: BaseContext,
 }
+
+// =============================================================================
+// Tests
+// =============================================================================
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::build_state::BuildState;
+    use crate::util::test_scenarios::multihop_scenario;
+    use askama::Template;
+
+    /// Helper to replay events into a fresh BuildState
+    fn build_state_from_events(events: &[crate::data_build_event::Event]) -> BuildState {
+        let mut state = BuildState::default();
+        for event in events {
+            state.handle_event(event);
+        }
+        state
+    }
+
+    mod want_detail_page {
+        use super::*;
+
+        /// Tests that the want detail page shows the job runs that serviced this want.
+        /// This is the "Fulfillment - Job Runs" section in the UI.
+        ///
+        /// Given: The multihop scenario completes (beta job dep-misses, alpha built, beta retries)
+        /// When: We render the beta want detail page
+        /// Then: It should show both beta job runs (beta-job-1 and beta-job-2)
+        #[test]
+        fn test_shows_servicing_job_runs() {
+            let (events, ids) = multihop_scenario();
+            let state = build_state_from_events(&events);
+
+            // Get beta want and render its detail page
+            let want_detail = state
+                .get_want(&ids.beta_want_id)
+                .expect("beta want should exist");
+            let template = WantDetailPage {
+                base: BaseContext::default(),
+                want: WantDetailView::from(want_detail),
+            };
+            let html = template.render().expect("template should render");
+
+            // Verify the Fulfillment section exists and contains both job run IDs
+            assert!(
+                html.contains(&ids.beta_job_1_id),
+                "Should show beta-job-1 in fulfillment section. HTML:\n{}",
+                html
+            );
+            assert!(
+                html.contains(&ids.beta_job_2_id),
+                "Should show beta-job-2 in fulfillment section. HTML:\n{}",
+                html
+            );
+        }
+
+        /// Tests that the want detail page shows derivative wants spawned by dep-miss.
+        /// This is the "Fulfillment - Derivative Wants" section in the UI.
+        ///
+        /// Given: The multihop scenario completes (beta job dep-misses, spawning alpha want)
+        /// When: We render the beta want detail page
+        /// Then: It should show the alpha want as a derivative
+        #[test]
+        fn test_shows_derivative_wants() {
+            let (events, ids) = multihop_scenario();
+            let state = build_state_from_events(&events);
+
+            // Get beta want and render its detail page
+            let want_detail = state
+                .get_want(&ids.beta_want_id)
+                .expect("beta want should exist");
+
+            // Fetch derivative wants (like the http_server does)
+            let derivative_wants: Vec<_> = want_detail
+                .derivative_want_ids
+                .iter()
+                .filter_map(|id| state.get_want(id))
+                .map(|w| DerivativeWantView::from(&w))
+                .collect();
+
+            let template = WantDetailPage {
+                base: BaseContext::default(),
+                want: WantDetailView::new(&want_detail, derivative_wants),
+            };
+            let html = template.render().expect("template should render");
+
+            // Verify the Fulfillment section exists and contains the derivative want
+            assert!(
+                html.contains(&ids.alpha_want_id),
+                "Should show alpha-want as derivative want. HTML:\n{}",
+                html
+            );
+        }
+    }
+}

databuild/web/templates/job_runs/detail.html

@@ -54,4 +54,43 @@
 </div>
 {% endif %}
 
+{% if !job_run.read_partitions.is_empty() %}
+<div class="detail-section">
+    <h2>Read Partitions ({{ job_run.read_partitions.len() }})</h2>
+    <ul class="partition-list">
+        {% for p in job_run.read_partitions %}
+        <li>
+            <a href="/partitions/{{ p.partition_ref_encoded }}" class="partition-ref">{{ p.partition_ref }}</a>
+            <span style="color:var(--color-text-muted);font-size:.75rem;font-family:monospace;margin-left:.5rem">uuid: {{ p.uuid }}</span>
+        </li>
+        {% endfor %}
+    </ul>
+</div>
+{% endif %}
+
+{% if !job_run.wrote_partitions.is_empty() %}
+<div class="detail-section">
+    <h2>Wrote Partitions ({{ job_run.wrote_partitions.len() }})</h2>
+    <ul class="partition-list">
+        {% for p in job_run.wrote_partitions %}
+        <li>
+            <a href="/partitions/{{ p.partition_ref_encoded }}" class="partition-ref">{{ p.partition_ref }}</a>
+            <span style="color:var(--color-text-muted);font-size:.75rem;font-family:monospace;margin-left:.5rem">uuid: {{ p.uuid }}</span>
+        </li>
+        {% endfor %}
+    </ul>
+</div>
+{% endif %}
+
+{% if !job_run.derivative_want_ids.is_empty() %}
+<div class="detail-section">
+    <h2>Derivative Wants ({{ job_run.derivative_want_ids.len() }})</h2>
+    <ul class="partition-list">
+        {% for id in job_run.derivative_want_ids %}
+        <li><a href="/wants/{{ id }}">{{ id }}</a></li>
+        {% endfor %}
+    </ul>
+</div>
+{% endif %}
+
 {% call base::footer() %}

databuild/web/templates/partitions/detail.html

@@ -32,9 +32,34 @@
     </div>
 </div>
 
+{% match partition.built_by_job_run_id %}
+{% when Some with (job_run_id) %}
+<div class="detail-section">
+    <h2>Lineage - Built By</h2>
+    <p>
+        <a href="/job_runs/{{ job_run_id }}">{{ job_run_id }}</a>
+        <span style="color:var(--color-text-muted);font-size:.75rem;margin-left:.5rem">(view job run for input partitions)</span>
+    </p>
+</div>
+{% when None %}
+{% endmatch %}
+
+{% if !partition.downstream_partition_uuids.is_empty() %}
+<div class="detail-section">
+    <h2>Lineage - Downstream Consumers ({{ partition.downstream_partition_uuids.len() }})</h2>
+    <ul class="partition-list">
+        {% for uuid in partition.downstream_partition_uuids %}
+        <li>
+            <span style="font-family:monospace;font-size:.8125rem">{{ uuid }}</span>
+        </li>
+        {% endfor %}
+    </ul>
+</div>
+{% endif %}
+
 {% if !partition.job_run_ids.is_empty() %}
 <div class="detail-section">
-    <h2>Job Runs ({{ partition.job_run_ids.len() }})</h2>
+    <h2>Related Job Runs ({{ partition.job_run_ids.len() }})</h2>
     <ul class="partition-list">
         {% for id in partition.job_run_ids %}
         <li><a href="/job_runs/{{ id }}">{{ id }}</a></li>

databuild/web/templates/wants/detail.html

@@ -65,4 +65,56 @@
 </div>
 {% endif %}
 
+{% if !want.job_runs.is_empty() %}
+<div class="detail-section">
+    <h2>Fulfillment - Job Runs ({{ want.job_runs.len() }})</h2>
+    <table class="data-table">
+        <thead>
+            <tr>
+                <th>ID</th>
+                <th>Job Label</th>
+                <th>Started</th>
+                <th>Duration</th>
+                <th>Status</th>
+            </tr>
+        </thead>
+        <tbody>
+            {% for jr in want.job_runs %}
+            <tr>
+                <td><a href="/job_runs/{{ jr.id }}">{{ jr.id }}</a></td>
+                <td>{{ jr.job_label }}</td>
+                <td>{% match jr.started_at %}{% when Some with (ts) %}{{ ts }}{% when None %}-{% endmatch %}</td>
+                <td>{% match jr.started_at %}{% when Some with (started) %}{% match jr.queued_at %}{% when Some with (queued) %}{{ started - queued }}ms{% when None %}-{% endmatch %}{% when None %}-{% endmatch %}</td>
+                <td>{% match jr.status %}{% when Some with (s) %}<span class="status status-{{ s.name_lowercase }}">{{ s.name }}</span>{% when None %}-{% endmatch %}</td>
+            </tr>
+            {% endfor %}
+        </tbody>
+    </table>
+</div>
+{% endif %}
+
+{% if !want.derivative_wants.is_empty() %}
+<div class="detail-section">
+    <h2>Fulfillment - Derivative Wants ({{ want.derivative_wants.len() }})</h2>
+    <table class="data-table">
+        <thead>
+            <tr>
+                <th>ID</th>
+                <th>Partitions</th>
+                <th>Status</th>
+            </tr>
+        </thead>
+        <tbody>
+            {% for dw in want.derivative_wants %}
+            <tr>
+                <td><a href="/wants/{{ dw.want_id }}">{{ dw.want_id }}</a></td>
+                <td>{% for p in dw.partitions %}{{ p.partition_ref }}{% if !loop.last %}, {% endif %}{% endfor %}</td>
+                <td>{% match dw.status %}{% when Some with (s) %}<span class="status status-{{ s.name|lower }}">{{ s.name }}</span>{% when None %}-{% endmatch %}</td>
+            </tr>
+            {% endfor %}
+        </tbody>
+    </table>
+</div>
+{% endif %}
+
 {% call base::footer() %}

docs/ideas/2025-11-30_wants-for-data-retention.md

@@ -0,0 +1,12 @@
+
+- You can't keep building partitions forever
+  - Space runs out for literal data, costs increase as data value decreases for old data
+  - Memory runs out for indexes over partitions, e.g. in databuild itself
+- We could introduce vacuuming?
+- We could introduce partition want expiry callbacks?
+- Jobs and job runs as partition edge transitions?
+- Do we even want to delete partition entries? Can just wait till this is a problem.
+- Partition want expiry events also enable non-event level reaction, e.g. vacuum for all events between time T1 and T2.
+- RISK! If partition to partition data deps (via jobs that change, etc) are not canonical/stable:
+  - We cannot assert the necessity of upstream partitions for anything longer than the initial job time to success (because it may have changed)
+  - To make this valuable, we need to be able to assume that the reads/data deps from a singular parameterized job run are durable, because then we can propagate want times and have a durable "why does this partition need to exist"

docs/ideas/event-sourced-cpn-framework.md

@@ -0,0 +1,241 @@
+# Event-Sourced CPN Framework
+
+A vision for a Rust library/framework combining event sourcing, Colored Petri Net semantics, and compile-time safety for building correct distributed systems.
+
+## The Problem
+
+In highly connected applications with multiple entity types and relationships (like databuild's Wants, JobRuns, Partitions), developers face combinatorial complexity:
+
+For each edge type between entities, you need:
+1. Forward accessor
+2. Inverse accessor (index)
+3. Index maintenance on creation
+4. Index maintenance on deletion
+5. Consistency checks
+6. Query patterns for traversal
+
+As the number of entities and edges grows, this becomes:
+- Hard to keep in your head
+- Error-prone (forgot to update an index)
+- Lots of boilerplate
+- Testing burden for plumbing rather than business logic
+
+The temptation is to "throw hands up" and use SQL with foreign keys, or accept eventual consistency. But this sacrifices the compile-time guarantees Rust can provide.
+
+## The Vision
+
+A framework where developers declare:
+- **Entities** with their valid states (state machines)
+- **Edges** between entities (typed, directional, with cardinality)
+- **Transitions** (what state changes are valid, and when)
+
+And the framework provides:
+- Auto-generated accessors (both directions)
+- Auto-maintained indexes
+- Compile-time invalid transition errors
+- Runtime referential integrity (fail-fast or transactional)
+- Event log as source of truth with replay capability
+- Potential automatic concurrency from CPN place-disjointness
+
+## Why
+
+### Correctness Guarantees
+
+- **Compile-time**: Invalid state transitions are type errors
+- **Compile-time**: Edge definitions guarantee bidirectional navigability
+- **Runtime**: Referential integrity violations detected immediately
+- **Result**: "If it compiles and the event log replays, the state is consistent"
+
+### Performance "For Free"
+
+- Indexes auto-maintained as edges are created/destroyed
+- No query planning needed - traversal patterns known at compile time
+- Potential: CPN place-disjointness → automatic safe concurrency
+
+### Developer Experience
+
+- Declare entities, states, edges, transitions
+- Library generates: accessors, inverse indexes, transition methods, consistency checks
+- Focus on *what* not *how* - the plumbing disappears
+- Still Rust: escape hatch to custom logic when needed
+
+### Testing Burden Reduction
+
+- No tests for "did I update the index correctly"
+- No tests for "can I traverse this relationship backwards"
+- Focus tests on business logic, not graph bookkeeping
+
+## How
+
+### Foundations
+
+- **Colored Petri Nets** for state machine composition semantics
+- **Typestate pattern** for compile-time transition validity
+- **Event sourcing** for persistence and replay
+
+### Implementation Approach
+
+Declarative DSL or proc macros for entity/edge/transition definitions:
+
+```rust
+// Hypothetical syntax
+entity! {
+    Want {
+        states: [New, Idle, Building, Successful, Failed, Canceled],
+        transitions: [
+            New -> Idle,
+            New -> Building,
+            Idle -> Building,
+            Building -> Successful,
+            Building -> Failed,
+            // ...
+        ]
+    }
+}
+
+edge! {
+    servicing_wants: JobRun -> many Want,
+    built_by: Partition -> one JobRun,
+}
+```
+
+Code generation produces:
+- Entity structs with state type parameters
+- Edge storage with auto-maintained inverses
+- Transition methods that enforce valid source states
+- Query methods for traversal in both directions
+
+### The Graph Model
+
+- Entities are nodes (with state)
+- Edges are typed, directional, with cardinality (one/many)
+- Both directions always queryable
+- Edge creation/deletion is transactional within a step
+
+### Entry Point
+
+Single `step(event) -> Result<(), StepError>` that:
+1. Validates the event against current state
+2. Applies state transitions
+3. Updates all affected indexes
+4. Returns success or rolls back
+
+## Transactionality
+
+### Beyond Fail-Fast
+
+Instead of panicking on consistency violations, support transactional semantics:
+
+```rust
+// Infallible (panics on error)
+state.step(event);
+
+// Fallible (returns error, state unchanged on failure)
+state.try_step(event) -> Result<(), StepError>;
+
+// Explicit transaction (for multi-event atomicity)
+let txn = state.begin();
+txn.apply(event1)?;
+txn.apply(event2)?;
+txn.commit(); // or rollback on drop
+```
+
+### What This Enables
+
+1. **Local atomicity**: A single event either fully applies or doesn't - no partial states
+
+2. **Distributed coordination**: If `step` can return `Err` instead of panicking:
+   - Try to apply an event
+   - If it fails, coordinate with other systems before retrying
+   - Implement saga patterns, 2PC, etc.
+
+3. **Speculative execution**: "What if I applied this event?" without committing
+   - Useful for validation, dry-runs, conflict detection
+
+4. **Optimistic concurrency**:
+   - Multiple workers try to apply events concurrently
+   - Conflicts detected and rolled back
+   - Retry with updated state
+
+### Implementation Options
+
+1. **Copy-on-write / snapshot**: Clone state, apply to clone, swap on success
+   - Simple but memory-heavy for large state
+
+2. **Command pattern / undo log**: Record inverse operations, replay backwards on rollback
+   - More complex, but efficient for small changes to large state
+
+3. **MVCC-style**: Version all entities, only "commit" versions on success
+   - Most sophisticated, enables concurrent reads during transaction
+
+## Relationship to Datomic
+
+[Datomic](https://docs.datomic.com/datomic-overview.html) is a distributed database built on similar principles that validates many of these ideas in production:
+
+### Shared Concepts
+
+| Concept | Datomic | This Framework |
+|---------|---------|----------------|
+| Immutable facts | Datoms (E-A-V-T tuples) | BEL events |
+| Time travel | `as-of` queries | Event replay |
+| Speculative execution | [`d/with`](https://docs.datomic.com/transactions/transaction-processing.html) | `try_step()` / transactions |
+| Atomic commits | `d/transact` = `d/with` + durable swap | `step()` = validate + apply + persist |
+| Transaction-time validation | [Transaction functions](https://docs.datomic.com/transactions/transaction-functions.html) with `db-before` | Transition guards |
+| Post-transaction validation | [Entity specs](https://docs.datomic.com/transactions/model.html) with `db-after` | Invariant checks |
+| Single writer | Transactor serializes all writes | Single `step()` entry point |
+| Horizontal read scaling | Peers cache and query locally | Immutable state snapshots |
+
+### Datomic's Speculative Writes
+
+Datomic's `d/with` is particularly relevant - it's a [pure function](https://vvvvalvalval.github.io/posts/2018-11-12-datomic-event-sourcing-without-the-hassle.html) that takes a database value and proposed facts, returning a new database value *without persisting*. This enables:
+
+- Testing transactions without mutation
+- Composing transaction data before committing
+- [Enforcing invariants](https://stackoverflow.com/questions/48268887/how-to-prevent-transactions-from-violating-application-invariants-in-datomic) by speculatively applying, checking, then committing or aborting
+- Development against production data safely (via libraries like Datomock)
+
+### What Datomic Doesn't Provide
+
+- **CPN state machine semantics**: Typed transitions between entity states
+- **Compile-time transition validity**: Invalid transitions caught by the type system
+- **Auto-generated bidirectional indexes**: Declared edges automatically traversable both ways
+- **Rust**: Memory safety, zero-cost abstractions, embeddable
+
+The vision here is essentially: *Datomic's transaction model + CPN state machines + Rust compile-time safety*
+
+## Open Questions
+
+- How to express transition guards (conditions beyond "in state X")?
+- How to handle edges to entities that don't exist yet (forward references)?
+- Serialization format for the event log?
+- How much CPN formalism to expose vs. hide?
+- What's the right granularity for "places" in the CPN model?
+- How does this interact with async/distributed systems?
+
+## Potential Names
+
+Something evoking: event-sourced + graph + state machines + Rust
+
+- `petri-graph`
+- `ironweave` (iron = Rust, weave = connected graph)
+- `factforge`
+- `datumflow`
+
+## Prior Art to Investigate
+
+- Datomic (Clojure, distributed immutable database)
+- Bevy ECS (Rust, entity-component-system with events)
+- CPN Tools (Petri net modeling/simulation)
+- Diesel / SeaORM (Rust, compile-time SQL checking)
+- EventStoreDB (event sourcing infrastructure)
+
+## Next Steps
+
+This document captures the "why" and "how" at a conceptual level. To validate:
+
+1. Prototype the macro/DSL syntax for a simple 2-3 entity system
+2. Implement auto-indexed bidirectional edges
+3. Implement typestate transitions
+4. Add speculative execution (`try_step`)
+5. Benchmark against hand-written equivalent
+6. Evaluate ergonomics in real use (databuild as first consumer)

docs/narrative/what-llms-dont-do.md

@@ -0,0 +1,7 @@
+
+# What LLMs Don't Do
+
+- Create and cultivate technical strategy
+  - Don't have a specific vision of the organizing formalization of the problem + the technical solution
+- Adhere to technical strategy
+  - Please please please just read the relevant docs!

docs/plans/detail-lineage.md

@@ -0,0 +1,230 @@
+# Detail & Lineage Views
+
+## Vision
+
+Provide rich, navigable views into databuild's execution history that answer operational questions:
+
+- **"What work was done to fulfill this want?"** - The full DAG of partitions built and jobs run
+- **"Where did this data come from?"** - Trace a partition's lineage back through its inputs
+- **"What downstream data uses this?"** - Understand impact before tainting or debugging staleness
+
+## Three Distinct Views
+
+### 1. Want Fulfillment View
+
+Shows the work tree rooted at a want: all partitions built, jobs run, and derivative wants spawned to fulfill it.
+
+```
+W-001 "data/gamma" [Successful]
+│
+├── data/gamma [Live, uuid:abc]
+│   └── JR-789 [Succeeded]
+│       ├── read: data/beta [Live, uuid:def]
+│       └── read: data/alpha [Live, uuid:ghi]
+│
+└── derivative: W-002 "data/beta" [Successful]
+    │   └── triggered by: JR-456 dep-miss
+    │
+    └── data/beta [Live, uuid:def]
+        └── JR-456 [DepMiss → retry → Succeeded]
+            └── read: data/alpha [Live, uuid:ghi]
+```
+
+Key insight: This shows **specific partition instances** (by UUID), not just refs. A want's fulfillment is a concrete snapshot of what was built.
+
+### 2. Partition Lineage View
+
+The data flow graph: partition ↔ job_run alternating. Navigable upstream (inputs) and downstream (consumers).
+
+```
+              UPSTREAM
+                 │
+    ┌────────────┼────────────┐
+    ▼            ▼            ▼
+[data/a]    [data/b]    [data/c]
+    │            │            │
+    └────────────┼────────────┘
+                 ▼
+            JR-xyz [Succeeded]
+                 │
+                 ▼
+         ══════════════════
+         ║  data/beta     ║  ← FOCUS
+         ║  [Live]        ║
+         ══════════════════
+                 │
+                 ▼
+            JR-abc [Running]
+                 │
+    ┌────────────┼────────────┐
+    ▼            ▼            ▼
+[data/x]    [data/y]    [data/z]
+                 │
+              DOWNSTREAM
+```
+
+This view answers: "What data flows into/out of this partition?" Click to navigate.
+
+### 3. JobRun Detail View
+
+Not a graph - just the immediate context of a single job execution:
+
+- **Scheduled for**: Which want(s) triggered this job
+- **Read**: Input partitions (with UUIDs - the specific versions read)
+- **Wrote**: Output partitions (with UUIDs)
+- **Status history**: Queued → Running → Succeeded/Failed/DepMiss
+- **If DepMiss**: Which derivative wants were spawned
+
+## Data Requirements
+
+### Track read_deps on success
+
+Currently only captured on dep-miss. Need to extend `JobRunSuccessEventV1`:
+
+```protobuf
+message JobRunSuccessEventV1 {
+  string job_run_id = 1;
+  repeated ReadDeps read_deps = 2;  // NEW
+}
+```
+
+### Inverted consumer index
+
+To answer "what reads this partition", need:
+
+```rust
+partition_consumers: BTreeMap<Uuid, Vec<(Uuid, String)>>  // input_uuid → (output_uuid, job_run_id)
+```
+
+Indexed by UUID (not ref) because partition refs get reused across rebuilds, but UUIDs are immutable per instance. This preserves historical lineage correctly.
+
+Built from read_deps when processing JobRunSuccessEventV1.
+
+## Design Decisions
+
+1. **Retries**: List all job runs triggered by a want, collapsing retries in the UI (expandable)
+2. **Lineage UUIDs**: Resolve partition refs to canonical UUIDs at job success time (jobs don't need to know about UUIDs)
+3. **High fan-out**: Truncate to N items with "+X more" expansion
+4. **Consumer index by UUID**: Index consumers by partition UUID (not ref) since refs get reused across rebuilds but UUIDs are immutable per instance
+5. **Job run as lineage source of truth**: Partition details don't duplicate upstream info - they reference their builder job run, which holds the read_deps
+
+## API Response Pattern
+
+Detail and list endpoints return a wrapper with the primary data plus a shared index of related entities:
+
+```protobuf
+message GetJobRunResponse {
+  JobRunDetail data = 1;
+  RelatedEntities index = 2;
+}
+
+message ListJobRunsResponse {
+  repeated JobRunDetail data = 1;
+  RelatedEntities index = 2;  // shared across all items
+}
+
+message RelatedEntities {
+  map<string, PartitionDetail> partitions = 1;
+  map<string, JobRunDetail> job_runs = 2;
+  map<string, WantDetail> wants = 3;
+}
+```
+
+**Why this pattern:**
+- **No recursion** - Detail types stay flat, don't embed each other
+- **Deduplication** - Each entity appears once in the index, even if referenced by multiple items in `data`
+- **O(1) lookup** - Templates access `index.partitions["data/beta"]` directly
+- **Composable** - Same pattern works for single-item and list endpoints
+
+## Implementation Plan
+
+### ✅ Phase 1: Data Model (Complete)
+
+**1.1 Extend JobRunSuccessEventV1**
+
+```protobuf
+message JobRunSuccessEventV1 {
+  string job_run_id = 1;
+  repeated ReadDeps read_deps = 2;  // preserves impacted→read relationships
+}
+```
+
+**1.2 Extend SucceededState to store resolved UUIDs**
+
+```rust
+pub struct SucceededState {
+    pub succeeded_at: u64,
+    pub read_deps: Vec<ReadDeps>,                        // from event
+    pub read_partition_uuids: BTreeMap<String, Uuid>,    // ref → UUID at read time
+    pub wrote_partition_uuids: BTreeMap<String, Uuid>,   // ref → UUID (from building_partitions)
+}
+```
+
+UUIDs resolved by looking up canonical partitions when processing success event.
+
+**1.3 Add consumer index to BuildState**
+
+```rust
+// input_uuid → list of (output_uuid, job_run_id)
+partition_consumers: BTreeMap<Uuid, Vec<(Uuid, String)>>
+```
+
+Populated from `read_deps` when processing JobRunSuccessEventV1. Uses UUIDs (not refs) to preserve historical lineage across partition rebuilds.
+
+### ✅ Phase 2: API Response Pattern (Complete)
+
+**2.1 RelatedEntities wrapper**
+
+Added `RelatedEntities` message and `index` field to all Get*/List* responses.
+
+**2.2 HasRelatedIds trait**
+
+Implemented trait for Want, JobRun, Partition that returns the IDs of related entities. Query layer uses this to build the index.
+
+**2.3 Query methods**
+
+Added `*_with_index()` methods that collect related IDs via the trait and resolve them to full entity details.
+
+### ✅ Phase 3: Job Integration (Complete)
+
+Jobs already emit `DATABUILD_DEP_READ_JSON` and the full pipeline is wired up:
+
+1. **Job execution** (`job_run.rs`): `SubProcessBackend::poll` parses `DATABUILD_DEP_READ_JSON` lines from stdout and stores in `SubProcessCompleted.read_deps`
+2. **Event creation** (`job_run.rs`): `to_event()` creates `JobRunSuccessEventV1` with `read_deps`
+3. **Event handling** (`event_handlers.rs`): `handle_job_run_success()` resolves `read_partition_uuids` and `wrote_partition_uuids`, populates `partition_consumers` index
+4. **API serialization** (`job_run_state.rs`): `to_detail()` includes `read_deps`, `read_partition_uuids`, `wrote_partition_uuids` in `JobRunDetail`
+
+### ✅ Phase 4: Frontend (Complete)
+
+**4.1 JobRun detail page**
+
+Added to `job_runs/detail.html`:
+- "Read Partitions" section showing partition refs with UUIDs (linked to partition detail)
+- "Wrote Partitions" section showing partition refs with UUIDs (linked to partition detail)
+- "Derivative Wants" section showing wants spawned by dep-miss (linked to want detail)
+
+Extended `JobRunDetailView` with:
+- `read_deps: Vec<ReadDepsView>` - impacted→read dependency relationships
+- `read_partitions: Vec<PartitionRefWithUuidView>` - input partitions with UUIDs
+- `wrote_partitions: Vec<PartitionRefWithUuidView>` - output partitions with UUIDs
+- `derivative_want_ids: Vec<String>` - derivative wants from dep-miss
+
+**4.2 Partition detail page**
+
+Added to `partitions/detail.html`:
+- "Lineage - Built By" section showing the builder job run (linked to job run detail for upstream lineage)
+- "Lineage - Downstream Consumers" section showing UUIDs of downstream partitions
+
+Extended `PartitionDetailView` with:
+- `built_by_job_run_id: Option<String>` - job run that built this partition
+- `downstream_partition_uuids: Vec<String>` - downstream consumers from index
+
+**4.3 Want detail page**
+
+Added to `wants/detail.html`:
+- "Fulfillment - Job Runs" section listing all job runs that serviced this want
+- "Fulfillment - Derivative Wants" section listing derivative wants spawned by dep-misses
+
+Extended `WantDetailView` with:
+- `job_run_ids: Vec<String>` - all job runs that serviced this want
+- `derivative_want_ids: Vec<String>` - derivative wants spawned

examples/multihop/databuild.json

@@ -3,7 +3,7 @@
   "jobs": [
     {
       "label": "//examples/multihop:job_alpha",
-      "entrypoint": "./examples/multihop/job_alpha.sh",
+      "entrypoint": "./job_alpha.sh",
       "environment": {
         "JOB_NAME": "alpha"
       },
@@ -11,7 +11,7 @@
     },
     {
       "label": "//examples/multihop:job_beta",
-      "entrypoint": "./examples/multihop/job_beta.sh",
+      "entrypoint": "./job_beta.sh",
       "environment": {
         "JOB_NAME": "beta"
       },

examples/podcast_reviews/MODULE.bazel.lock

@@ -10,8 +10,9 @@
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@@ -31,8 +32,11 @@
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@@ -48,7 +52,8 @@
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@@ -61,13 +66,14 @@
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+    "https://bcr.bazel.build/modules/platforms/1.0.0/MODULE.bazel": "f05feb42b48f1b3c225e4ccf351f367be0371411a803198ec34a389fb22aa580",
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@@ -93,7 +99,9 @@
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@@ -108,8 +116,8 @@
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@@ -149,12 +157,11 @@
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