init codebase

api/resources/migrations/004-create-community-members.up.sql

@@ -0,0 +1,9 @@
+CREATE TABLE IF NOT EXISTS community_members (
+  community_id  uuid        NOT NULL REFERENCES communities (id) ON DELETE CASCADE,
+  user_id       uuid        NOT NULL REFERENCES users (id) ON DELETE CASCADE,
+  role          text        NOT NULL CHECK (role IN ('owner', 'admin', 'member')),
+  nickname      text,
+  avatar_url    text,
+  joined_at     timestamptz DEFAULT now(),
+  PRIMARY KEY (community_id, user_id)
+);