implemented optional authentification app and stricter password and user rules.

Also against brute force.

app/models/login_attempt.py

@@ -0,0 +1,19 @@
+from .. import db
+
+
+class LoginAttempt(db.Model):
+    __tablename__ = "login_attempts"
+
+    id = db.Column(db.Integer, primary_key=True)
+    ip_address = db.Column(db.String(45), nullable=False)
+    username = db.Column(db.String(80), nullable=False)
+    failed_attempts = db.Column(db.Integer, nullable=False, default=0, server_default=db.text("0"))
+    locked_until = db.Column(db.DateTime)
+    last_failed_at = db.Column(db.DateTime)
+
+    __table_args__ = (
+        db.UniqueConstraint("ip_address", "username", name="uq_login_attempt_ip_username"),
+    )
+
+    def __repr__(self):
+        return f"<LoginAttempt {self.ip_address}:{self.username}>"