init codebase

api/resources/migrations/008-create-messages.up.sql

@@ -0,0 +1,9 @@
+CREATE TABLE IF NOT EXISTS messages (
+  id          uuid        PRIMARY KEY DEFAULT gen_random_uuid(),
+  channel_id  uuid        NOT NULL REFERENCES channels (id) ON DELETE CASCADE,
+  user_id     uuid        REFERENCES users (id) ON DELETE SET NULL,
+  parent_id   uuid        REFERENCES messages (id) ON DELETE SET NULL,
+  body_md     text        NOT NULL,
+  created_at  timestamptz DEFAULT now(),
+  edited_at   timestamptz
+);