06/05 Optimize app: logs will be saved to db

app/utils/db_log_handler.py

@@ -0,0 +1,49 @@
+"""
+SQLAlchemy-backed logging handler.
+
+Writes app.* log records to the app_logs table so the web viewer
+can query, filter, and purge them without touching the log file.
+
+Safety rules:
+  - Never raises — all errors are silently swallowed to avoid crashing the app
+  - Reentrancy guard prevents infinite recursion (SQLAlchemy emits its own logs)
+  - Skips sqlalchemy.* and werkzeug loggers to avoid noise / recursion
+"""
+
+import logging
+import traceback
+from datetime import datetime
+
+
+_SKIP_PREFIXES = ('sqlalchemy', 'werkzeug', 'urllib3', 'plaid_handler')
+
+
+class DBLogHandler(logging.Handler):
+    _inside_emit = False
+
+    def emit(self, record):
+        if DBLogHandler._inside_emit:
+            return
+        if any(record.name.startswith(p) for p in _SKIP_PREFIXES):
+            return
+        DBLogHandler._inside_emit = True
+        try:
+            from app.extensions import db
+            from app.models.app_log import AppLog
+
+            msg = record.getMessage()
+            if record.exc_info:
+                msg += '\n' + ''.join(traceback.format_exception(*record.exc_info)).rstrip()
+
+            entry = AppLog(
+                timestamp=datetime.utcfromtimestamp(record.created),
+                level=record.levelname,
+                module=record.name,
+                message=msg,
+            )
+            db.session.add(entry)
+            db.session.commit()
+        except Exception:
+            pass
+        finally:
+            DBLogHandler._inside_emit = False