feat: create a model for subtasks

migrations/2024-09-08-083610_create_subtasks/down.sql

@@ -0,0 +1,4 @@
+-- This file should undo anything in `up.sql`
+
+
+DROP TABLE IF EXISTS "subtasks";

migrations/2024-09-08-083610_create_subtasks/up.sql

@@ -0,0 +1,15 @@
+-- Your SQL goes here
+
+
+CREATE TABLE "subtasks"(
+	"id" SERIAL NOT NULL PRIMARY KEY,
+	"task_id" INT4 NOT NULL,
+	"title" TEXT NOT NULL,
+	"is_completed" BOOL NOT NULL,
+	"created_at" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+	"updated_at" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+	FOREIGN KEY ("task_id") REFERENCES "tasks"("id") ON DELETE CASCADE
+);
+
+SELECT diesel_manage_updated_at('subtasks');
+