Replace db-ui with pgAdmin 4 for better cross-platform compatibility

DOCKER COMPOSE:

- Replaced ghcr.io/n7olkachev/db-ui with dpage/pgadmin4:latest

- Added pgadmin_data volume for persistent configuration

- Configured pgAdmin with default credentials

- Port mapping: 3000:80 (pgAdmin runs on port 80 internally)

DOCUMENTATION:

- Updated README.md with pgAdmin login instructions and first-time setup

- Updated QUICKSTART.md with detailed pgAdmin configuration steps

- Added server connection details for easy setup

BENEFITS:

- pgAdmin has proper multi-platform support (linux/amd64, linux/arm64, etc.)

- Industry-standard PostgreSQL management tool

- More features: query builder, schema visualization, data import/export

- Better documentation and community support

README.md

@@ -139,7 +139,7 @@ docker-compose up -d
 
 This starts:
 - **PostgreSQL 16** on port `5432`
-- **DB-UI** web interface on port `3000`
+- **pgAdmin 4** web interface on port `3000`
 
 ### 5. Initialize the Schema
 ```bash
@@ -157,11 +157,26 @@ This starts:
 
 ### 6. Access the Database
 
-**Option A: DB-UI Web Interface**
+**Option A: pgAdmin Web Interface**
 ```
 http://localhost:3000
 ```
 
+**Login credentials:**
+- Email: `admin@businessanalytics.local`
+- Password: `SecurePass123!`
+
+**First time setup:**
+1. After logging in, click "Add New Server"
+2. **General tab:** Name: `Business Analytics`
+3. **Connection tab:**
+   - Host: `postgres`
+   - Port: `5432`
+   - Database: `business_analytics`
+   - Username: `data_analyst`
+   - Password: `SecurePass123!`
+4. Click "Save"
+
 **Option B: Command Line**
 ```bash
 docker exec -it business_analytics_db psql -U data_analyst -d business_analytics
@@ -446,7 +461,7 @@ This project is licensed under the MIT License - see the [LICENSE](LICENSE) file
 ## 🙏 Acknowledgments
 
 - PostgreSQL community
-- DB-UI project (https://github.com/n7olkachev/db-ui)
+- pgAdmin project (https://www.pgadmin.org/)
 - Financial crime investigation best practices
 
 ## 📧 Support

docker-compose.yml

@@ -30,24 +30,24 @@ services:
       retries: 5
     restart: unless-stopped
 
-  db-ui:
-    image: ghcr.io/n7olkachev/db-ui:latest
-    platform: unknown/unknown
+  pgadmin:
+    image: dpage/pgadmin4:latest
     container_name: business_analytics_ui
     environment:
-      POSTGRES_HOST: postgres
-      POSTGRES_USER: data_analyst
-      POSTGRES_PASSWORD: SecurePass123!
-      POSTGRES_DB: business_analytics
-      POSTGRES_PORT: 5432
+      PGADMIN_DEFAULT_EMAIL: admin@businessanalytics.local
+      PGADMIN_DEFAULT_PASSWORD: SecurePass123!
+      PGADMIN_CONFIG_SERVER_MODE: 'False'
+      PGADMIN_CONFIG_MASTER_PASSWORD_REQUIRED: 'False'
     ports:
-      - "3000:3000"
+      - "3000:80"
     networks:
       - analytics_network
     depends_on:
       postgres:
         condition: service_healthy
     restart: unless-stopped
+    volumes:
+      - pgadmin_data:/var/lib/pgadmin
 
 networks:
   analytics_network:
@@ -56,4 +56,6 @@ networks:
 volumes:
   postgres_data:
     driver: local
+  pgadmin_data:
+    driver: local
 

docs/QUICKSTART.md

@@ -64,7 +64,7 @@ docker-compose up -d
 
 **What this does:**
 - Starts PostgreSQL 16 database
-- Starts DB-UI web interface
+- Starts pgAdmin 4 web interface
 - Creates network and volumes
 
 **Verify it's running:**
@@ -138,18 +138,32 @@ The script shows progress for each step:
 
 ### Step 4: Access the Database
 
-#### Option A: DB-UI Web Interface (Recommended for Beginners)
+#### Option A: pgAdmin Web Interface (Recommended for Beginners)
 
 1. Open your browser to: **http://localhost:3000**
-2. You'll see the database tables in the sidebar
-3. Click any table to browse data
-4. Use the "Custom SQL" tab to run queries
+2. **Login:**
+   - Email: `admin@businessanalytics.local`
+   - Password: `SecurePass123!`
+3. **First time setup - Add Server:**
+   - Click "Add New Server"
+   - **General tab:** Name: `Business Analytics`
+   - **Connection tab:**
+     - Host: `postgres`
+     - Port: `5432`
+     - Database: `business_analytics`
+     - Username: `data_analyst`
+     - Password: `SecurePass123!`
+   - Click "Save"
+4. Navigate to: **Servers > Business Analytics > Databases > business_analytics > Schemas > public > Tables**
+5. Right-click any table and select "View/Edit Data" to browse
+6. Use **Tools > Query Tool** to run SQL queries
 
 **Features:**
-- Visual table browser
-- SQL query editor with syntax highlighting
-- Export results to CSV
-- Schema introspection
+- Professional database management interface
+- Visual query builder
+- Data export/import (CSV, JSON, etc.)
+- Schema visualization
+- Query history and favorites
 
 #### Option B: Command Line (psql)
 
@@ -366,7 +380,7 @@ docker-compose up -d
 
 ## 💡 Tips
 
-1. **Use DB-UI for exploration** - Great for browsing and understanding the schema
+1. **Use pgAdmin for exploration** - Great for browsing and understanding the schema
 2. **Use psql for practice** - Best for learning SQL commands
 3. **Start simple** - Begin with basic SELECT queries before complex joins
 4. **Check the exercises** - They're designed to build your skills progressively