# app/internal/incident_correlator.py

- *`correlate_call`* — added units and vehicles optional params; when provided (per-scene from intelligence extraction), they take priority over the merged call-document values, preventing multi-scene unit contamination
- *Cross-TGID correlation path (2.5)* — *new path between location and slow paths*: when a call shares 2+ unit IDs with a recent same-system, same-type incident AND embedding similarity ≥ 0.85, it links them — catches multi-talkgroup pursuits like the bicycle search that split across dispatch/tactical/geographic channels
# `app/internal/intelligence.py`
- *`reassignment` field* — added to the GPT-4o-mini prompt schema and rules; `true` when dispatch is actively pulling a unit to a new, different call (not a status update or en route acknowledgement); returned in every processed scene dict
- *Tag location rule* — added explicit instruction to the prompt: tags must describe what happened, not where; place names, road names, and talkgroup names are explicitly forbidden as tags
# `app/routers/upload.py`
- Both scene correlation call sites (`_run_extraction_pipeline` and `_run_intelligence_pipeline`) now pass `units=corr_units` where `corr_units = [] if scene.get("reassignment") else scene.get("units") `— suppresses unit overlap matching when a unit is being reassigned to a new call, preventing chaining into their previous incident
- Both sites also pass `vehicles=scene.get("vehicles")` (per-scene vehicles, from the multi-scene units fix)
# `app/config.py`
- `embedding_cross_tg_threshold: float = 0.85` — threshold for the new cross-TGID path

drb-c2-core/app/config.py

@@ -26,6 +26,7 @@ class Settings(BaseSettings):
     correlation_window_hours: int = 2          # slow/location path: max hours since last call
     embedding_similarity_threshold: float = 0.93  # slow-path: requires location corroboration
     embedding_no_location_threshold: float = 0.97 # slow-path: match without location (very high bar)
+    embedding_cross_tg_threshold: float = 0.85    # cross-TG path: same dept + 2+ shared units
     location_proximity_km: float = 0.5        # radius for location-proximity matching
     incident_auto_resolve_minutes: int = 90   # auto-resolve after N minutes with no new calls
     recorrelation_scan_minutes: int = 60      # re-examine orphaned calls ended within this window

drb-c2-core/app/internal/incident_correlator.py

@@ -92,6 +92,8 @@ async def correlate_call(
     location_coords: Optional[dict] = None,
     reference_time: Optional[datetime] = None,
     create_if_new: bool = True,
+    units: Optional[list[str]] = None,
+    vehicles: Optional[list[str]] = None,
 ) -> Optional[str]:
     """
     Link call_id to an existing incident or create a new one.
@@ -115,8 +117,12 @@ async def correlate_call(
     # Fetch call doc once — reused for disambiguation, embedding merge, unit accumulation
     call_doc      = await fstore.doc_get("calls", call_id) or {}
     call_embedding: Optional[list] = call_doc.get("embedding")
-    call_units:    list[str]       = call_doc.get("units")    or []
+    # Prefer explicitly passed units/vehicles (per-scene, from intelligence extraction)
-    call_vehicles: list[str]       = call_doc.get("vehicles") or []
+    # over the call doc, which merges units from ALL scenes in a multi-scene recording.
+    # Falling back to the call doc is correct for recorrelation sweeps where we have no
+    # scene-level breakdown.
+    call_units:    list[str] = units    if units    is not None else (call_doc.get("units")    or [])
+    call_vehicles: list[str] = vehicles if vehicles is not None else (call_doc.get("vehicles") or [])
     call_severity: str             = call_doc.get("severity") or "unknown"
     # Use passed coords first (freshly geocoded), fall back to what's on the call doc
     coords: Optional[dict] = location_coords or call_doc.get("location_coords")
@@ -210,6 +216,42 @@ async def correlate_call(
                 )
                 break
 
+    # ── 2.5. Cross-TG path: same department, overlapping units, moderate similarity ──
+    #
+    # Catches pursuits / searches that span multiple talkgroup IDs within the same
+    # department (e.g. dispatch → tactical → geographic channel).  The fast path
+    # is TGID-scoped so it never links these.  Two conditions together provide
+    # strong evidence of the same scene without needing location:
+    #   • 2+ shared unit IDs  (same officers working the same call)
+    #   • embedding similarity >= cross-TG threshold (same subject matter)
+    # Requiring 2+ shared units prevents single-officer false positives.
+    if not matched_incident and call_embedding and incident_type and call_units and system_id:
+        call_unit_set = set(call_units)
+        best_cross_score = 0.0
+        best_cross_inc: Optional[dict] = None
+        for inc in recent:
+            if inc.get("type") != incident_type:
+                continue
+            if system_id not in (inc.get("system_ids") or []):
+                continue
+            inc_units_set = set(inc.get("units") or [])
+            if len(call_unit_set & inc_units_set) < 2:
+                continue
+            inc_embedding = inc.get("embedding")
+            if not inc_embedding:
+                continue
+            sim = _cosine_similarity(call_embedding, inc_embedding)
+            if sim > best_cross_score:
+                best_cross_score = sim
+                best_cross_inc   = inc
+        if best_cross_inc and best_cross_score >= settings.embedding_cross_tg_threshold:
+            matched_incident = best_cross_inc
+            logger.info(
+                f"Correlator cross-TG path: call {call_id} → {best_cross_inc['incident_id']} "
+                f"(sim={best_cross_score:.3f}, "
+                f"shared_units={len(call_unit_set & set(best_cross_inc.get('units') or []))})"
+            )
+
     # ── 3. Slow path: embedding similarity (time-limited, same type) ──────────
     #
     # Two tiers:

drb-c2-core/app/internal/intelligence.py

@@ -31,16 +31,18 @@ Response format — a JSON object with a "scenes" array. Each scene:
   units: list of unit IDs or officer numbers explicitly mentioned
   severity: one of "minor" | "moderate" | "major" | "unknown"
   resolved: true if this scene explicitly signals incident closure, false otherwise
+  reassignment: true if dispatch is actively pulling a unit away from their current assignment to respond to a new, different call — e.g. "Baker, can you clear and respond to...", "Adam, break from that and go to...". False if the unit is simply reporting in, updating status, or continuing their current assignment.
   transcript_corrected: corrected text for this scene's transmissions only, or null
 
 Rules:
 - location: prefer intersections > addresses > mile markers > route+town > route alone > town alone. Empty string if none.
-- tags: specific, lowercase, hyphenated. Do not repeat incident_type as a tag.
+- tags: describe WHAT happened, not WHERE. Specific, lowercase, hyphenated. Do not use location names, road names, talkgroup names, or place names as tags (wrong: "lower-macy's", "canvas-route-6", "route-202"; right: "suspect-search", "shoplifting", "vehicle-pursuit"). Do not repeat incident_type as a tag.
 - units: only identifiers explicitly mentioned, not inferred.
 - Do not invent details not present in the transcript.
 - incident_type: let the talkgroup channel be your primary signal. Use "fire" ONLY if the talkgroup is clearly a fire/rescue channel OR the transcript explicitly describes active fire, smoke, flames, or structure fire activation. Police or EMS referencing a fire scene → use "police" or "ems". When uncertain, prefer "other" over "fire".
 - ten_codes: interpret radio codes using the department reference provided below. Do not guess codes not listed.
 - resolved: true only when the scene explicitly signals "Code 4", "all clear", "10-42", "in custody", "patient transported", "fire out", "GOA", "negative contact", "scene clear".
+- reassignment: only true when a unit is explicitly being pulled to a completely new call or location. A unit going en route to their first dispatch is NOT a reassignment. Routine status updates, acknowledgements, and scene updates are NOT reassignments.
 - transcript_corrected: fix only clear STT/vocoder errors (e.g. "Several" → "10-4", misheard street names, garbled unit IDs). Keep all radio language as-is — do NOT decode codes into plain English. Return null if accurate.
 
 System: {system_id}
@@ -130,6 +132,7 @@ async def extract_scenes(
         units:              list[str]      = scene.get("units") or []
         severity:           str            = scene.get("severity") or "unknown"
         resolved:           bool           = bool(scene.get("resolved", False))
+        reassignment:       bool           = bool(scene.get("reassignment", False))
         transcript_corrected: Optional[str]= scene.get("transcript_corrected") or None
         segment_indices:    Optional[list] = scene.get("segment_indices")
 
@@ -160,6 +163,7 @@ async def extract_scenes(
             "units":                units,
             "severity":             severity,
             "resolved":             resolved,
+            "reassignment":         reassignment,
             "transcript_corrected": transcript_corrected,
             "segment_indices":      segment_indices,
             "embedding":            embedding,

drb-c2-core/app/routers/upload.py

@@ -110,6 +110,9 @@ async def _run_extraction_pipeline(
     all_tags: list[str] = []
     for scene in scenes:
         all_tags.extend(scene["tags"])
+        # When dispatch is pulling a unit to a NEW call (reassignment), suppress unit
+        # overlap so the new scene doesn't chain into the unit's previous incident.
+        corr_units = [] if scene.get("reassignment") else scene.get("units")
         incident_id = await incident_correlator.correlate_call(
             call_id=call_id,
             node_id=node_id,
@@ -120,6 +123,8 @@ async def _run_extraction_pipeline(
             incident_type=scene["incident_type"],
             location=scene["location"],
             location_coords=scene["location_coords"],
+            units=corr_units,
+            vehicles=scene.get("vehicles"),
         )
         if incident_id and incident_id not in incident_ids:
             incident_ids.append(incident_id)
@@ -206,6 +211,7 @@ async def _run_intelligence_pipeline(
     if flags["correlation_enabled"]:
         for scene in scenes:
             all_tags.extend(scene["tags"])
+            corr_units = [] if scene.get("reassignment") else scene.get("units")
             incident_id = await incident_correlator.correlate_call(
                 call_id=call_id,
                 node_id=node_id,
@@ -216,6 +222,8 @@ async def _run_intelligence_pipeline(
                 incident_type=scene["incident_type"],
                 location=scene["location"],
                 location_coords=scene["location_coords"],
+                units=corr_units,
+                vehicles=scene.get("vehicles"),
             )
             if incident_id and incident_id not in incident_ids:
                 incident_ids.append(incident_id)