fix(avatar): prevent stale deployment images

digital-avatar-app/backend/main.py

@@ -1,13 +1,14 @@
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
-import os
+import importlib.util
 import logging
+import os
 
 from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from apscheduler.triggers.interval import IntervalTrigger
 
-from database import init_db, SessionLocal
+from database import engine, init_db, SessionLocal
 from models import Avatar, Authorization, Organization, TokenAccount, TokenPlan, User
 from fastapi.staticfiles import StaticFiles
 import routers.avatars
@@ -54,7 +55,31 @@ app.mount("/api/files", StaticFiles(directory=UPLOAD_DIR), name="knowledge-files
 
 @app.get("/api/health")
 def health():
-    return ok({"status": "ok"})
+    checks = _runtime_checks()
+    return ok({
+        "status": "ok" if all(checks.values()) else "degraded",
+        "gitSha": os.getenv("APP_GIT_SHA", "unknown"),
+        "buildTime": os.getenv("APP_BUILD_TIME", "unknown"),
+        "checks": checks,
+    })
+
+
+def _runtime_checks():
+    return {
+        "database": _database_is_ready(),
+        "uploads": os.path.isdir(UPLOAD_DIR) and os.access(UPLOAD_DIR, os.W_OK),
+        "pdfOcr": importlib.util.find_spec("pymupdf") is not None,
+    }
+
+
+def _database_is_ready():
+    try:
+        with engine.connect() as connection:
+            connection.exec_driver_sql("SELECT 1")
+        return True
+    except Exception:
+        logger.exception("Database readiness check failed")
+        return False
 
 
 def seed():