BLOG-95 Seperate SQL migration files (#98)

### Description

- In beta environment, `v0.3.0` migration has been run, a manual revertion is required; in real environment, there is nothing to do, but to do #97 and remove migration record for `v0.1.1` manually.

### Package Changes

_No response_

### Screenshots

_No response_

### Reference

Resolves #95

### Checklist

- [x] A milestone is set
- [x] The related issuse has been linked to this branch

Reviewed-on: #98
Co-authored-by: SquidSpirit <squid@squidspirit.com>
Co-committed-by: SquidSpirit <squid@squidspirit.com>

backend/migrations/20250725231740_v0.3.0.sql

@@ -1,30 +0,0 @@
-CREATE TABLE "image" (
-    "id" SERIAL PRIMARY KEY NOT NULL,
-    "mime_type" VARCHAR(100) NOT NULL,
-    "deleted_time" TIMESTAMP,
-    "created_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    "updated_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
-);
-
-CREATE TABLE "user" (
-    "id" SERIAL PRIMARY KEY NOT NULL,
-    "issuer" VARCHAR(100) NOT NULL,
-    "source_id" VARCHAR(100) NOT NULL,
-    "displayed_name" VARCHAR(100) NOT NULL,
-    "email" VARCHAR(100) NOT NULL,
-    "created_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    "updated_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
-);
-
-CREATE UNIQUE INDEX "user_source_id_issuer_key" ON "user" ("source_id", "issuer");
-CREATE INDEX "user_email_key" ON "user" HASH ("email");
-
-CREATE TRIGGER "update_image_updated_time"
-BEFORE UPDATE ON "image"
-FOR EACH ROW
-EXECUTE FUNCTION update_updated_time_column();
-
-CREATE TRIGGER "update_user_updated_time"
-BEFORE UPDATE ON "user"
-FOR EACH ROW
-EXECUTE FUNCTION update_updated_time_column();

backend/migrations/20250801061907_create_update_updated_time_function.sql

@@ -0,0 +1,6 @@
+CREATE OR REPLACE FUNCTION update_updated_time_column() RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_time = CURRENT_TIMESTAMP;
+    return NEW;
+END;
+$$ LANGUAGE 'plpgsql';

backend/migrations/20250801061939_create_post_table.sql

@@ -0,0 +1,16 @@
+CREATE TABLE IF NOT EXISTS "post" (
+    "id" SERIAL PRIMARY KEY NOT NULL,
+    "title" TEXT NOT NULL,
+    "description" TEXT NOT NULL,
+    "preview_image_url" TEXT NOT NULL,
+    "content" TEXT NOT NULL,
+    "published_time" TIMESTAMP,
+    "deleted_time" TIMESTAMP,
+    "created_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE OR REPLACE TRIGGER "update_post_updated_time"
+BEFORE UPDATE ON "post"
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_time_column();

backend/migrations/20250801062007_create_label_table.sql

@@ -0,0 +1,13 @@
+CREATE TABLE IF NOT EXISTS "label" (
+    "id" SERIAL PRIMARY KEY NOT NULL,
+    "name" TEXT NOT NULL,
+    "color" BIGINT NOT NULL CHECK ("color" >= 0 AND "color" <= 4294967295),
+    "deleted_time" TIMESTAMP,
+    "created_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE OR REPLACE TRIGGER "update_label_updated_time"
+BEFORE UPDATE ON "label"
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_time_column();

backend/migrations/20250801062251_create_post_label_table.sql

@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS "post_label" (
+    "post_id" INTEGER NOT NULL,
+    "label_id" INTEGER NOT NULL,
+    PRIMARY KEY ("post_id", "label_id"),
+    FOREIGN KEY ("post_id") REFERENCES "post" ("id") ON DELETE CASCADE,
+    FOREIGN KEY ("label_id") REFERENCES "label" ("id") ON DELETE CASCADE
+);

backend/migrations/20250801062344_create_image_table.sql

@@ -0,0 +1,12 @@
+CREATE TABLE IF NOT EXISTS "image" (
+    "id" SERIAL PRIMARY KEY NOT NULL,
+    "mime_type" VARCHAR(100) NOT NULL,
+    "deleted_time" TIMESTAMP,
+    "created_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE OR REPLACE TRIGGER "update_image_updated_time"
+BEFORE UPDATE ON "image"
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_time_column();

backend/migrations/20250801062412_create_user_table.sql

@@ -0,0 +1,20 @@
+CREATE TABLE IF NOT EXISTS "user" (
+    "id" SERIAL PRIMARY KEY NOT NULL,
+    "issuer" VARCHAR(100) NOT NULL,
+    "source_id" VARCHAR(100) NOT NULL,
+    "displayed_name" VARCHAR(100) NOT NULL,
+    "email" VARCHAR(100) NOT NULL,
+    "created_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_time" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS "idx_user_source_id_issuer"
+ON "user" ("source_id", "issuer");
+
+CREATE INDEX IF NOT EXISTS "idx_user_email"
+ON "user" ("email");
+
+CREATE OR REPLACE TRIGGER "update_user_updated_time"
+BEFORE UPDATE ON "user"
+FOR EACH ROW
+EXECUTE FUNCTION update_updated_time_column();