feat(db): migrate from SQLite to PostgreSQL via Drizzle ORM

README.md

@@ -8,13 +8,14 @@ A modern, high-performance Kanban & Workflow web application designed to help yo
 ![Tailwind CSS](https://img.shields.io/badge/Tailwind-v4-38bdf8?style=flat-square&logo=tailwind-css)
 ![Auth.js](https://img.shields.io/badge/Auth.js-v5-purple?style=flat-square)
 ![Drizzle ORM](https://img.shields.io/badge/Drizzle-ORM-C5F74F?style=flat-square&logo=drizzle)
+![PostgreSQL](https://img.shields.io/badge/PostgreSQL-16-4169E1?style=flat-square&logo=postgresql)
 
 ## 🛠️ Tech Stack
 
 - **Framework:** [Next.js 16](https://nextjs.org/) (App Router, Route Groups)
 - **UI & Styling:** [React 19](https://react.dev/), [Tailwind CSS v4](https://tailwindcss.com/)
 - **Authentication:** [Auth.js v5 (NextAuth)](https://authjs.dev/) with Credentials Provider & bcrypt hashing
-- **Database & ORM:** [Drizzle ORM](https://orm.drizzle.team/) & Drizzle Kit
+- **Database & ORM:** [PostgreSQL](https://www.postgresql.org/) managed via [Drizzle ORM](https://orm.drizzle.team/) & Drizzle Kit
 
 ## 📂 Architecture & Structure
 
@@ -27,4 +28,4 @@ The project uses Next.js Route Groups to separate public and protected applicati
 
 ## 🎯 Current Status
 
-_In Progress_ — Core layout structure, responsive navigation, and authentication (Auth.js v5) are implemented. Next up: Migration from SQLite to PostgreSQL via Drizzle ORM.
+_In Progress_ — Core layout structure, responsive navigation, PostgreSQL database integration via Drizzle ORM, and full authentication (Auth.js v5) are implemented.

db/index.ts

@@ -1,15 +1,15 @@
 /**
- * @file db/index.ts (oder ähnlich)
- * @description Initializes the SQLite database connection using better-sqlite3 and sets up the Drizzle ORM instance with the provided schema.
+ * @file db/index.ts
+ * @description Initializes the PostgreSQL database connection using postgres-js and configures the Drizzle ORM instance.
  */
 
-import { drizzle } from "drizzle-orm/better-sqlite3";
-import Database from "better-sqlite3";
+import { drizzle } from "drizzle-orm/postgres-js";
 import * as schema from "./schema";
+import postgres from "postgres";
 
-const sqlite = new Database("./sqlite.db");
+const client = postgres(process.env.DATABASE_URL!, { prepare: false });
 
 /**
- * The Drizzle ORM database instance configured for SQLite with type definitions from the schema.
+ * The Drizzle ORM database instance configured for PostgreSQL with type definitions from the schema.
  */
-export const db = drizzle(sqlite, { schema });
+export const db = drizzle(client, { schema });

db/schema.ts

@@ -1,20 +1,18 @@
 /**
- * @file db/schema.ts (oder ähnlich)
- * @description Defines the SQLite database schema for users and exports related TypeScript types using Drizzle ORM.
+ * @file db/schema.ts
+ * @description Defines the PostgreSQL database schema for users using UUIDs, timestamps, and Drizzle ORM.
  */
 
-import { sqliteTable, text, integer } from "drizzle-orm/sqlite-core";
+import { pgTable, text, timestamp, uuid } from "drizzle-orm/pg-core";
 
 /**
  * Database table definition for application users.
  */
-export const usersTable = sqliteTable("users", {
-  id: integer("id").primaryKey({ autoIncrement: true }),
+export const usersTable = pgTable("users", {
+  id: uuid("id").defaultRandom().primaryKey(),
   email: text("email").notNull().unique(),
   password: text("password").notNull(),
-  createdAt: integer("created_at", { mode: "timestamp" })
-    .$defaultFn(() => new Date())
-    .notNull(),
+  createdAt: timestamp("created_at").defaultNow().notNull(),
 });
 
 /**

drizzle.config.ts

@@ -1,18 +1,18 @@
 /**
  * @file drizzle.config.ts
- * @description Drizzle Kit configuration file specifying schema locations, migration output directories, and database connection credentials for SQLite.
+ * @description Drizzle Kit configuration file for managing database migrations, schema paths, and database credentials.
  */
 
 import { defineConfig } from "drizzle-kit";
 
 /**
- * Configuration object for Drizzle Kit CLI commands (migrations, introspection, studio).
+ * Configuration object exported for Drizzle Kit CLI commands.
  */
 export default defineConfig({
   schema: "./db/schema.ts",
   out: "./db/migrations",
-  dialect: "sqlite",
+  dialect: "postgresql",
   dbCredentials: {
-    url: "./sqlite.db",
+    url: process.env.DATABASE_URL!,
   },
 });

package-lock.json

@@ -9,17 +9,16 @@
       "version": "0.1.0",
       "dependencies": {
         "bcryptjs": "^3.0.3",
-        "better-sqlite3": "^13.0.2",
         "drizzle-orm": "^0.45.2",
         "lucide-react": "^1.28.0",
         "next": "16.2.12",
         "next-auth": "^5.0.0-beta.32",
+        "postgres": "^3.4.9",
         "react": "19.2.4",
         "react-dom": "19.2.4"
       },
       "devDependencies": {
         "@tailwindcss/postcss": "^4",
-        "@types/better-sqlite3": "^9.6.0",
         "@types/node": "^20",
         "@types/react": "^19",
         "@types/react-dom": "^19",
@@ -2584,16 +2583,6 @@
         "tslib": "^2.4.0"
       }
     },
-    "node_modules/@types/better-sqlite3": {
-      "version": "9.6.0",
-      "resolved": "https://registry.npmjs.org/@types/better-sqlite3/-/better-sqlite3-9.6.0.tgz",
-      "integrity": "sha512-ZEEwBSgMu7GYJOynoagg5X9JbxfL6dTJDsgViJIqh67jV44kyOr9RXfmFjLK5rzC4MWssP06t9hu/JwGDnUbCg==",
-      "devOptional": true,
-      "license": "MIT",
-      "dependencies": {
-        "@types/node": "*"
-      }
-    },
     "node_modules/@types/estree": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
@@ -3608,18 +3597,6 @@
         "bcrypt": "bin/bcrypt"
       }
     },
-    "node_modules/better-sqlite3": {
-      "version": "13.0.2",
-      "resolved": "https://registry.npmjs.org/better-sqlite3/-/better-sqlite3-13.0.2.tgz",
-      "integrity": "sha512-jW6oufeDhXZaiX9Lw5A+oerVClx4iFrI6uDj1zu7SqUAjak9vbJvA0NEcKLNxHiQHb6kYCoFzzXYV0YOauhV3g==",
-      "license": "MIT",
-      "dependencies": {
-        "node-addon-api": "^8.0.0"
-      },
-      "engines": {
-        "node": ">=22"
-      }
-    },
     "node_modules/brace-expansion": {
       "version": "1.1.18",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.18.tgz",
@@ -6501,15 +6478,6 @@
         }
       }
     },
-    "node_modules/node-addon-api": {
-      "version": "8.9.1",
-      "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-8.9.1.tgz",
-      "integrity": "sha512-4eUQWVPCUUUiBjLnHS3cXWeC6ryoPUc0U3rP7IuzapoGbzMqd/r6KKO0clr0b+snQhsrueFEhCZDdK+LK7hxKg==",
-      "license": "MIT",
-      "engines": {
-        "node": "^18 || ^20 || >= 21"
-      }
-    },
     "node_modules/node-exports-info": {
       "version": "1.6.2",
       "resolved": "https://registry.npmjs.org/node-exports-info/-/node-exports-info-1.6.2.tgz",
@@ -6837,6 +6805,19 @@
         "node": "^10 || ^12 || >=14"
       }
     },
+    "node_modules/postgres": {
+      "version": "3.4.9",
+      "resolved": "https://registry.npmjs.org/postgres/-/postgres-3.4.9.tgz",
+      "integrity": "sha512-GD3qdB0x1z9xgFI6cdRD6xu2Sp2WCOEoe3mtnyB5Ee0XrrL5Pe+e4CCnJrRMnL1zYtRDZmQQVbvOttLnKDLnaw==",
+      "license": "Unlicense",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "type": "individual",
+        "url": "https://github.com/sponsors/porsager"
+      }
+    },
     "node_modules/preact": {
       "version": "10.24.3",
       "resolved": "https://registry.npmjs.org/preact/-/preact-10.24.3.tgz",

package.json

@@ -10,17 +10,16 @@
   },
   "dependencies": {
     "bcryptjs": "^3.0.3",
-    "better-sqlite3": "^13.0.2",
     "drizzle-orm": "^0.45.2",
     "lucide-react": "^1.28.0",
     "next": "16.2.12",
     "next-auth": "^5.0.0-beta.32",
+    "postgres": "^3.4.9",
     "react": "19.2.4",
     "react-dom": "19.2.4"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
-    "@types/better-sqlite3": "^9.6.0",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",