split todo backend from frontend

migrations/2021-08-06-173217_create_block/down.sql

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+-- This file should undo anything in `up.sql`
+DROP TABLE IF EXISTS blocks;

migrations/2021-08-06-173217_create_block/up.sql

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+-- Your SQL goes here
+CREATE TABLE IF NOT EXISTS blocks (
+    id UUID DEFAULT gen_random_uuid() PRIMARY KEY,
+    user_id UUID NOT NULL,
+    block_type VARCHAR(255) NOT NULL,
+    props JSON NOT NULL,
+    children TEXT[],
+    created_at TIMESTAMP DEFAULT NOW() NOT NULL,
+    updated_at TIMESTAMP DEFAULT NOW() NOT NULL
+);
+
+SELECT diesel_manage_updated_at('blocks');