fix: handle observations regeneration when memories get deleted

hindsight-api/hindsight_api/api/http.py

@@ -1235,6 +1235,14 @@ class DeleteResponse(BaseModel):
     deleted_count: int | None = None
 
 
+class ClearMemoryObservationsResponse(BaseModel):
+    """Response model for clearing observations for a specific memory."""
+
+    model_config = ConfigDict(json_schema_extra={"example": {"deleted_count": 3}})
+
+    deleted_count: int
+
+
 class BankStatsResponse(BaseModel):
     """Response model for bank statistics endpoint."""
 
@@ -3549,6 +3557,40 @@ async def api_clear_observations(bank_id: str, request_context: RequestContext =
             logger.error(f"Error in DELETE /v1/default/banks/{bank_id}/observations: {error_detail}")
             raise HTTPException(status_code=500, detail=str(e))
 
+    @app.delete(
+        "/v1/default/banks/{bank_id}/memories/{memory_id}/observations",
+        response_model=ClearMemoryObservationsResponse,
+        summary="Clear observations for a memory",
+        description="Delete all observations derived from a specific memory and reset it for re-consolidation. "
+        "The memory itself is not deleted. A consolidation job is triggered automatically so the memory "
+        "will produce fresh observations on the next consolidation run.",
+        operation_id="clear_memory_observations",
+        tags=["Memory"],
+    )
+    async def api_clear_memory_observations(
+        bank_id: str,
+        memory_id: str,
+        request_context: RequestContext = Depends(get_request_context),
+    ):
+        """Clear all observations derived from a specific memory."""
+        try:
+            result = await app.state.memory.clear_observations_for_memory(
+                bank_id=bank_id,
+                memory_id=memory_id,
+                request_context=request_context,
+            )
+            return ClearMemoryObservationsResponse(deleted_count=result["deleted_count"])
+        except (AuthenticationError, HTTPException):
+            raise
+        except Exception as e:
+            import traceback
+
+            error_detail = f"{str(e)}\n\nTraceback:\n{traceback.format_exc()}"
+            logger.error(
+                f"Error in DELETE /v1/default/banks/{bank_id}/memories/{memory_id}/observations: {error_detail}"
+            )
+            raise HTTPException(status_code=500, detail=str(e))
+
     @app.get(
         "/v1/default/banks/{bank_id}/config",
         response_model=BankConfigResponse,

hindsight-api/hindsight_api/engine/consolidation/prompts.py

@@ -39,7 +39,8 @@
 - Keep specifics: names, numbers, locations. Never abstract into general principles.
 - NEVER merge observations about different people or unrelated topics.
 - REDUNDANT: same info worded differently → update existing.
-- CONTRADICTION/UPDATE: capture both states with temporal markers ("used to X, now Y")."""
+- CONTRADICTION/UPDATE: capture both states with temporal markers ("used to X, now Y").
+- RESOLVE REFERENCES: When a new fact provides a concrete value that resolves a vague placeholder in an existing observation (e.g., a location that corresponds to "home country", "hometown", "birthplace", "native language", "her ex", "that city"), UPDATE the existing observation to embed the resolved value explicitly. Example: new fact mentions grandma in Sweden + existing observation says "moved from her home country" → update to state "home country is Sweden"."""
 
 
 def build_consolidation_prompt(observations_mission: str | None = None) -> str: