feat(activity): Simplify query statements and improve code readability

backend/app/core/agent_auth.py

@@ -18,9 +18,7 @@ class AgentAuthContext:
 
 
 def _find_agent_for_token(session: Session, token: str) -> Agent | None:
-    agents = list(
-        session.exec(select(Agent).where(col(Agent.agent_token_hash).is_not(None)))
-    )
+    agents = list(session.exec(select(Agent).where(col(Agent.agent_token_hash).is_not(None))))
     for agent in agents:
         if agent.agent_token_hash and verify_agent_token(token, agent.agent_token_hash):
             return agent

backend/app/core/agent_tokens.py

@@ -41,7 +41,5 @@ def verify_agent_token(token: str, stored_hash: str) -> bool:
         return False
     salt = _b64decode(salt_b64)
     expected_digest = _b64decode(digest_b64)
-    candidate = hashlib.pbkdf2_hmac(
-        "sha256", token.encode("utf-8"), salt, iterations_int
-    )
+    candidate = hashlib.pbkdf2_hmac("sha256", token.encode("utf-8"), salt, iterations_int)
     return hmac.compare_digest(candidate, expected_digest)

backend/app/core/logging.py

@@ -66,9 +66,7 @@ class AppLogFilter(logging.Filter):
 class JsonFormatter(logging.Formatter):
     def format(self, record: logging.LogRecord) -> str:
         payload: dict[str, Any] = {
-            "timestamp": datetime.fromtimestamp(
-                record.created, tz=timezone.utc
-            ).isoformat(),
+            "timestamp": datetime.fromtimestamp(record.created, tz=timezone.utc).isoformat(),
             "level": record.levelname,
             "logger": record.name,
             "message": record.getMessage(),