added gunicorn and updated to the last version of server monitorizare

IT_asset_management/app/extensions.py

@@ -1,6 +1,9 @@
 from flask_sqlalchemy import SQLAlchemy
 from flask_migrate import Migrate
 from flask_login import LoginManager
+from sqlalchemy import event
+from sqlalchemy.engine import Engine
+import sqlite3
 
 db = SQLAlchemy()
 migrate = Migrate()
@@ -8,3 +11,18 @@ login_manager = LoginManager()
 login_manager.login_view = 'auth.login'
 login_manager.login_message = 'Please log in to access this page.'
 login_manager.login_message_category = 'warning'
+
+
+@event.listens_for(Engine, "connect")
+def _set_sqlite_pragma(dbapi_connection, connection_record):
+    """Enable WAL mode and sane concurrency settings for SQLite.
+
+    WAL lets readers and writers operate concurrently, which prevents
+    'database is locked' errors when running under multi-worker Gunicorn.
+    """
+    if isinstance(dbapi_connection, sqlite3.Connection):
+        cursor = dbapi_connection.cursor()
+        cursor.execute("PRAGMA journal_mode=WAL")
+        cursor.execute("PRAGMA busy_timeout=5000")
+        cursor.execute("PRAGMA synchronous=NORMAL")
+        cursor.close()