Import backend code inside the repository.

backend/resources/migrations/0006.emails.up.sql

@@ -0,0 +1,27 @@
+CREATE TYPE email_status AS ENUM ('pending', 'ok', 'failed');
+
+CREATE TABLE IF NOT EXISTS email_queue (
+  id uuid PRIMARY KEY DEFAULT uuid_generate_v4(),
+
+  created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
+  modified_at timestamptz NOT NULL DEFAULT clock_timestamp(),
+  deleted_at timestamptz DEFAULT NULL,
+
+  data bytea NOT NULL,
+
+  priority smallint NOT NULL DEFAULT 10
+                    CHECK (priority BETWEEN 0 and 10),
+
+  status email_status NOT NULL DEFAULT 'pending',
+  retries integer NOT NULL DEFAULT -1
+);
+
+-- Triggers
+
+CREATE TRIGGER email_queue_modified_at_tgr BEFORE UPDATE ON email_queue
+   FOR EACH ROW EXECUTE PROCEDURE update_modified_at();
+
+-- Indexes
+
+CREATE INDEX email_status_idx
+    ON email_queue (status);