bug fix

backend/time_util.py

@@ -26,11 +26,16 @@ _TLS = threading.local()
 def set_thread_user(user_id):
     """Set the current user for this thread (scheduler per-user iteration)."""
     _TLS.user_id = user_id
+    try:
+        del _TLS.tz
+    except AttributeError:
+        pass
 
 
 def clear_thread_user():
     try:
         del _TLS.user_id
+        del _TLS.tz
     except AttributeError:
         pass
 
@@ -78,30 +83,45 @@ def _load_tz() -> "pytz.BaseTzInfo":
 
 
 def get_tz() -> "pytz.BaseTzInfo":
-    """Return the configured timezone object. Cached per user in app config."""
+    """Return the configured timezone object.
+
+    Cached per-request (Flask ``g``) and per-thread (scheduler TLS), NOT per
+    process: a timezone change made on one Gunicorn worker must be visible to
+    the next request on ANY worker immediately (a process-wide cache would
+    serve stale timezones to other workers).
+    """
     try:
-        from flask import current_app
-        uid = _ctx_user_id()
-        if hasattr(current_app, "config") and "_timezone_cache" in current_app.config:
-            cache = current_app.config["_timezone_cache"]
-            if uid in cache:
-                return cache[uid]
-        tz = _load_tz()
-        if hasattr(current_app, "config"):
-            cache = current_app.config.setdefault("_timezone_cache", {})
-            cache[uid] = tz
-        return tz
+        from flask import has_request_context, g
+        if has_request_context():
+            cached = getattr(g, "_tz_cache", None)
+            if cached is not None:
+                return cached
+            tz = _load_tz()
+            g._tz_cache = tz
+            return tz
     except Exception:
-        return pytz.timezone(_DEFAULT_TZ_STR)
+        pass
+    # No request context (scheduler threads): cache per thread-user so each
+    # user's jobs use their own timezone without a DB hit per call.
+    tz = getattr(_TLS, "tz", None)
+    if tz is not None:
+        return tz
+    tz = _load_tz()
+    _TLS.tz = tz
+    return tz
 
 
 def clear_tz_cache():
-    """Force reload timezone on next call. Call after timezone config changes."""
+    """Force reload timezone on next call (called after timezone config changes)."""
     try:
-        from flask import current_app
-        current_app.config.pop("_timezone_cache", None)
+        from flask import g
+        g.__dict__.pop("_tz_cache", None)
     except Exception:
         pass
+    try:
+        del _TLS.tz
+    except AttributeError:
+        pass
 
 
 def set_tz(tz_str: str) -> bool: