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.

models.py

@@ -2,7 +2,7 @@ from datetime import datetime
 from typing import Optional
 
 from fastapi import Query
-from pydantic import BaseModel, EmailStr
+from pydantic import BaseModel, EmailStr, root_validator
 
 
 class CreateEvent(BaseModel):
@@ -19,8 +19,22 @@ class CreateEvent(BaseModel):
 
 
 class CreateTicket(BaseModel):
-    name: str
-    email: EmailStr
+    name: Optional[str] = None
+    email: Optional[EmailStr] = None
+    user_id: Optional[str] = None
+    
+    @root_validator
+    def validate_identifiers(cls, values):
+        # Ensure either (name AND email) OR user_id is provided
+        name = values.get('name')
+        email = values.get('email')
+        user_id = values.get('user_id')
+        
+        if not user_id and not (name and email):
+            raise ValueError("Either user_id or both name and email must be provided")
+        if user_id and (name or email):
+            raise ValueError("Cannot provide both user_id and name/email")
+        return values
 
 
 class Event(BaseModel):
@@ -43,8 +57,9 @@ class Ticket(BaseModel):
     id: str
     wallet: str
     event: str
-    name: str
-    email: str
+    name: Optional[str] = None
+    email: Optional[str] = None
+    user_id: Optional[str] = None
     registered: bool
     paid: bool
     time: datetime