Audit fixes: response_model validation, error handling, dead code, input sanitisation

- Add response_model to all 8 route endpoints for runtime validation and
  correct Swagger docs
- Remove global KeyError handler (routes catch it explicitly)
- Add catch-all Exception handler with logging for 500 responses
- Remove dead code in service.py get_case_graph (unused bucket variable)
- Explicit graph_backend validation in cmd_serve (memory|neo4j, else exit)
- Sanitise comma-separated query params (strip whitespace, filter empty)
- Move HTTPException to top-level import in routes.py
- Remove unused imports (Depends in dependencies.py, all_persona_names)
- Fix deprecated asyncio.get_event_loop() in test fixture

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

aucourt_ingest/api/dependencies.py

@@ -2,8 +2,6 @@
 
 from __future__ import annotations
 
-from fastapi import Depends
-
 from aucourt_ingest.api.service import QueryService
 
 _query_service: QueryService | None = None

aucourt_ingest/api/errors.py

@@ -2,15 +2,20 @@
 
 from __future__ import annotations
 
+import logging
+
 from fastapi import FastAPI, Request
 from fastapi.responses import JSONResponse
 
+logger = logging.getLogger(__name__)
+
 
 def register_error_handlers(app: FastAPI) -> None:
     @app.exception_handler(ValueError)
     async def value_error_handler(request: Request, exc: ValueError):
         return JSONResponse(status_code=400, content={"detail": str(exc)})
 
-    @app.exception_handler(KeyError)
+    @app.exception_handler(Exception)
-    async def key_error_handler(request: Request, exc: KeyError):
+    async def generic_error_handler(request: Request, exc: Exception):
-        return JSONResponse(status_code=404, content={"detail": str(exc)})
+        logger.exception("Unhandled exception in query API")
+        return JSONResponse(status_code=500, content={"detail": "Internal server error"})

aucourt_ingest/api/routes.py

@@ -2,24 +2,33 @@
 
 from __future__ import annotations
 
-from fastapi import APIRouter, Query, Depends
+from fastapi import APIRouter, HTTPException, Query, Depends
 
 from aucourt_ingest.api.dependencies import get_query_service
+from aucourt_ingest.api.schemas import (
+    CaseGraphSummary,
+    CaseSummary,
+    ChunkResult,
+    HealthResponse,
+    HybridResult,
+    JurorContextResponse,
+    PersonaInfo,
+)
 
 router = APIRouter(prefix="/api/v1")
 
 
-@router.get("/health")
+@router.get("/health", response_model=HealthResponse)
 async def health(svc=Depends(get_query_service)):
     return await svc.health()
 
 
-@router.get("/personas")
+@router.get("/personas", response_model=list[PersonaInfo])
 async def list_personas(svc=Depends(get_query_service)):
     return svc.list_personas()
 
 
-@router.get("/cases")
+@router.get("/cases", response_model=list[CaseSummary])
 async def list_cases(
     court: str | None = Query(None, description="Filter by court code"),
     limit: int = Query(50, ge=1, le=200),
@@ -29,7 +38,7 @@ async def list_cases(
     return await svc.list_cases(court=court, limit=limit, offset=offset)
 
 
-@router.get("/cases/search")
+@router.get("/cases/search", response_model=list[CaseSummary])
 async def search_cases(
     q: str = Query(..., description="Search query text"),
     limit: int = Query(10, ge=1, le=50),
@@ -38,7 +47,7 @@ async def search_cases(
     return await svc.search_cases(q=q, limit=limit)
 
 
-@router.get("/cases/{case_mnc}/juror/{persona}")
+@router.get("/cases/{case_mnc}/juror/{persona}", response_model=JurorContextResponse)
 async def get_juror_context(
     case_mnc: str,
     persona: str,
@@ -50,20 +59,18 @@ async def get_juror_context(
             case_mnc, persona, max_tokens,
         )
     except KeyError as e:
-        from fastapi import HTTPException
         raise HTTPException(status_code=404, detail=str(e))
 
 
-@router.get("/cases/{case_mnc}")
+@router.get("/cases/{case_mnc}", response_model=CaseGraphSummary)
 async def get_case_graph(case_mnc: str, svc=Depends(get_query_service)):
     result = await svc.get_case_graph(case_mnc)
     if result is None:
-        from fastapi import HTTPException
         raise HTTPException(status_code=404, detail=f"Case not found: {case_mnc}")
     return result
 
 
-@router.get("/search")
+@router.get("/search", response_model=list[ChunkResult])
 async def vector_search(
     q: str = Query(..., description="Query text"),
     top_k: int = Query(10, ge=1, le=50),
@@ -71,12 +78,12 @@ async def vector_search(
     doc_ids: str | None = Query(None, description="Comma-separated doc IDs"),
     svc=Depends(get_query_service),
 ):
-    types = chunk_types.split(",") if chunk_types else None
+    types = [t.strip() for t in chunk_types.split(",") if t.strip()] if chunk_types else None
-    docs = doc_ids.split(",") if doc_ids else None
+    docs = [d.strip() for d in doc_ids.split(",") if d.strip()] if doc_ids else None
     return svc.vector_search(q, top_k=top_k, chunk_types=types, doc_ids=docs)
 
 
-@router.get("/hybrid")
+@router.get("/hybrid", response_model=list[HybridResult])
 async def hybrid_search(
     q: str = Query(..., description="Query text"),
     persona: str | None = Query(None, description="Juror persona name"),

aucourt_ingest/api/service.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 import logging
 
-from aucourt_ingest.jury.personas import PERSONAS, get_persona, all_persona_names
+from aucourt_ingest.jury.personas import PERSONAS, get_persona
 from aucourt_ingest.jury.subgraph_query import SubgraphQuery
 from aucourt_ingest.storage.graph_db import GraphDB
 
@@ -133,8 +133,6 @@ class QueryService:
             node = await self._graph_db.get_node(nid)
             if node is None:
                 continue
-            bucket = node.label.lower() + "s" if node.label != "Witness" else "witnesses"
-            # Map labels to plural keys
             label_map = {
                 "Judge": "judges",
                 "Charge": "charges",

aucourt_ingest/main.py

@@ -310,7 +310,7 @@ def cmd_serve(args):
     if backend == "memory":
         from aucourt_ingest.storage.in_memory_graph_db import InMemoryGraphDB
         graph_db = InMemoryGraphDB()
-    else:
+    elif backend == "neo4j":
         from aucourt_ingest.storage.graph_db import Neo4jGraphDB
         graph_db = Neo4jGraphDB(
             uri=config.storage.neo4j_uri,
@@ -318,6 +318,9 @@ def cmd_serve(args):
             password=config.storage.neo4j_password,
             database=config.storage.neo4j_database,
         )
+    else:
+        print(f"Unknown graph backend: {backend} (valid: memory, neo4j)")
+        sys.exit(1)
 
     from aucourt_ingest.storage.vector_index import VectorIndex
     vector_index = VectorIndex(str(config.storage.chromadb_dir))

tests/test_api.py

@@ -5,6 +5,8 @@ All tests use InMemoryGraphDB + FakeVectorIndex — zero external services.
 
 from __future__ import annotations
 
+import asyncio
+
 import pytest
 from fastapi.testclient import TestClient
 
@@ -73,8 +75,7 @@ def seeded_graph():
     ]
     for c in chunks1:
         c.token_count = len(c.text) // 4
-    import asyncio
+    asyncio.run(builder.build_full(meta1, chunks1))
-    asyncio.get_event_loop().run_until_complete(builder.build_full(meta1, chunks1))
 
     # Case 2
     meta2 = CaseMeta(
@@ -96,7 +97,7 @@ def seeded_graph():
     ]
     for c in chunks2:
         c.token_count = len(c.text) // 4
-    asyncio.get_event_loop().run_until_complete(builder.build_full(meta2, chunks2))
+    asyncio.run(builder.build_full(meta2, chunks2))
 
     return db