Add Jellyfin login cache and admin-only stats

backend/app/db.py

@@ -61,7 +61,9 @@ def init_db() -> None:
                 auth_provider TEXT NOT NULL DEFAULT 'local',
                 created_at TEXT NOT NULL,
                 last_login_at TEXT,
-                is_blocked INTEGER NOT NULL DEFAULT 0
+                is_blocked INTEGER NOT NULL DEFAULT 0,
+                jellyfin_password_hash TEXT,
+                last_jellyfin_auth_at TEXT
             )
             """
         )
@@ -141,6 +143,14 @@ def init_db() -> None:
             conn.execute("ALTER TABLE users ADD COLUMN auth_provider TEXT NOT NULL DEFAULT 'local'")
         except sqlite3.OperationalError:
             pass
+        try:
+            conn.execute("ALTER TABLE users ADD COLUMN jellyfin_password_hash TEXT")
+        except sqlite3.OperationalError:
+            pass
+        try:
+            conn.execute("ALTER TABLE users ADD COLUMN last_jellyfin_auth_at TEXT")
+        except sqlite3.OperationalError:
+            pass
     _backfill_auth_providers()
     ensure_admin_user()
 
@@ -277,7 +287,8 @@ def get_user_by_username(username: str) -> Optional[Dict[str, Any]]:
     with _connect() as conn:
         row = conn.execute(
             """
-            SELECT id, username, password_hash, role, auth_provider, created_at, last_login_at, is_blocked
+            SELECT id, username, password_hash, role, auth_provider, created_at, last_login_at,
+                   is_blocked, jellyfin_password_hash, last_jellyfin_auth_at
             FROM users
             WHERE username = ?
             """,
@@ -294,6 +305,8 @@ def get_user_by_username(username: str) -> Optional[Dict[str, Any]]:
         "created_at": row[5],
         "last_login_at": row[6],
         "is_blocked": bool(row[7]),
+        "jellyfin_password_hash": row[8],
+        "last_jellyfin_auth_at": row[9],
     }
 
 
@@ -373,6 +386,22 @@ def set_user_password(username: str, password: str) -> None:
         )
 
 
+def set_jellyfin_auth_cache(username: str, password: str) -> None:
+    if not username or not password:
+        return
+    password_hash = hash_password(password)
+    timestamp = datetime.now(timezone.utc).isoformat()
+    with _connect() as conn:
+        conn.execute(
+            """
+            UPDATE users
+            SET jellyfin_password_hash = ?, last_jellyfin_auth_at = ?
+            WHERE username = ?
+            """,
+            (password_hash, timestamp, username),
+        )
+
+
 def _backfill_auth_providers() -> None:
     with _connect() as conn:
         rows = conn.execute(