feat: add database schema

db/schema.sql

@@ -0,0 +1,7 @@
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(255) NOT NULL UNIQUE,
+    email VARCHAR(255) NOT NULL UNIQUE,
+    password_hash VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);

docker-compose.yml

@@ -8,7 +8,8 @@ services:
     ports:
       - "5432:5432"
     volumes:
-      - postgres_data:/var/lib/postgresql/data
+      - ./db/postgres_vol:/var/lib/postgresql/data
+      - ./db/schema.sql:/docker-entrypoint-initdb.d/schema.sql
 
 volumes:
   postgres_data: