Adds public events endpoint and user tickets

Adds a public events endpoint that allows read-only access to all events.
Improves ticket management by adding support for user IDs as an identifier, alongside name and email.
This simplifies ticket creation for authenticated users and enhances security.
Also introduces an API endpoint to fetch tickets by user ID.

migrations.py

@@ -160,3 +160,17 @@ async def m005_add_image_banner(db):
     Add a column to allow an image banner for the event
     """
     await db.execute("ALTER TABLE events.events ADD COLUMN banner TEXT;")
+
+
+async def m006_add_user_id_support(db):
+    """
+    Add user_id column to tickets table to support LNbits user-id as identifier
+    Make name and email optional when user_id is provided
+    """
+    await db.execute("ALTER TABLE events.ticket ADD COLUMN user_id TEXT;")
+    
+    # Since SQLite doesn't support changing column constraints directly,
+    # we'll work around this by allowing the application logic to handle
+    # the validation that either (name AND email) OR user_id is provided
+    # The database will continue to expect name and email as NOT NULL
+    # but we'll insert empty strings for user_id tickets