init codebase

api/resources/migrations/009-create-attachments.up.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS attachments (
+  id            uuid    PRIMARY KEY DEFAULT gen_random_uuid(),
+  message_id    uuid    NOT NULL REFERENCES messages (id) ON DELETE CASCADE,
+  filename      text    NOT NULL,
+  content_type  text    NOT NULL,
+  size_bytes    bigint  NOT NULL,
+  storage_key   text    NOT NULL
+);