tsk-44: Record when message was sent (#48)

Closes #44

Reviewed-on: phoenix/textsender-api#48
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

migrations/schema.sql

@@ -1,6 +1,10 @@
 CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
 
 DROP TABLE IF EXISTS contacts CASCADE;
+DROP TABLE IF EXISTS messages CASCADE;
+DROP TABLE IF EXISTS scheduled_messages CASCADE;
+DROP TABLE IF EXISTS scheduled_message_events CASCADE;
+DROP TABLE IF EXISTS message_event_responses CASCADE;
 
 CREATE TABLE IF NOT EXISTS contacts (
     id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
@@ -28,4 +32,12 @@ CREATE TABLE IF NOT EXISTS scheduled_message_events (
     message_id UUID NOT NULL,
     scheduled_message_id UUID NOT NULL,
     created timestamptz DEFAULT now()
-)
+);
+
+CREATE TABLE IF NOT EXISTS message_event_responses (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    scheduled_message_event_id UUID NOT NULL,
+    response JSONB NOT NULL,
+    user_id UUID NOT NULL,
+    sent timestamptz NOT NULL
+);