feat(backend) rebuild start

backend/server/schema.sql

@@ -0,0 +1,32 @@
+CREATE TABLE tag
+(
+    id          SERIAL PRIMARY KEY,
+    name        VARCHAR(20) UNIQUE NOT NULL,
+    description TEXT
+);
+
+CREATE TABLE category
+(
+    id          SERIAL PRIMARY KEY,
+    name        VARCHAR(20) UNIQUE NOT NULL,
+    description TEXT
+);
+
+CREATE TABLE post
+(
+    id             SERIAL PRIMARY KEY,
+    identifier     VARCHAR(50) UNIQUE              NOT NULL,
+    title          VARCHAR(255)                    NOT NULL,
+    subtitle       VARCHAR(255)                    NOT NULL,
+    published_date DATE                            NOT NULL,
+    last_update    DATE,
+    content        TEXT                            NOT NULL,
+
+    category       SERIAL REFERENCES category (id) NOT NULL
+);
+
+CREATE TABLE post_tag
+(
+    post SERIAL REFERENCES post (id),
+    tag  SERIAL REFERENCES tag (id)
+)