Remove useless reports, avoid DB-Races

app/inbox_locks.py

@@ -7,13 +7,14 @@ from dataclasses import dataclass
 @dataclass
 class InboxRunLease:
     inbox_id: str
-    _lock: threading.Lock
+    _locks: list[threading.Lock]
     _released: bool = False
 
     def release(self) -> None:
         if not self._released:
             self._released = True
-            self._lock.release()
+            for lock in reversed(self._locks):
+                lock.release()
 
     def __enter__(self) -> "InboxRunLease":
         return self
@@ -25,14 +26,18 @@ class InboxRunLease:
 class InboxRunLocks:
     def __init__(self) -> None:
         self._guard = threading.Lock()
+        self._global_lock = threading.Lock()
         self._locks: dict[str, threading.Lock] = {}
 
     def acquire(self, inbox_id: str, *, blocking: bool = False) -> InboxRunLease | None:
+        if not self._global_lock.acquire(blocking=blocking):
+            return None
         with self._guard:
             lock = self._locks.setdefault(inbox_id, threading.Lock())
         if not lock.acquire(blocking=blocking):
+            self._global_lock.release()
             return None
-        return InboxRunLease(inbox_id=inbox_id, _lock=lock)
+        return InboxRunLease(inbox_id=inbox_id, _locks=[self._global_lock, lock])
 
     def active(self, inbox_id: str) -> bool:
         lease = self.acquire(inbox_id, blocking=False)