dev2main (#1)

* add management database functionality for allowed and banned pubkeys

* add policy to reject events based on validation rules

* expose PostgreSQL port in Docker Compose for local access

* add event rejection policy for banned pubkeys based on management database

---------

Co-authored-by: highperfocused <highperfocused@pm.me>

compose.yaml

@@ -23,8 +23,8 @@ services:
       - POSTGRES_DB=khatru-relay
       - POSTGRES_PASSWORD=postgres
       - POSTGRES_USER=postgres
-    # expose:
-    #   - 5432
+    ports:
+      - 127.0.0.1:5432:5432
     healthcheck:
       test: [ "CMD", "pg_isready" ]
       interval: 10s