[Doc] Getting Started - Database (#313)

* [Doc] Database - Init Page

* draft

* how to connect

* fix: typo / better sentence

* cursor it for better doc :)

* fix: indexing page section

Author: LatentDream

doc/_toc.yml

@@ -5,6 +5,7 @@ parts:
     chapters:
       - file: quickstart/signup
       - file: quickstart/app
+      - file: quickstart/database
       - file: quickstart/apikey
       - file: quickstart/support
 

doc/quickstart/database.md

@@ -0,0 +1,106 @@
+# Deploy a Database
+
+This guide walks you through deploying and connecting to a PostgreSQL database. You'll learn how to create a database instance and connect to it using either the command line or a graphical interface.
+
+## Table of Contents
+- [Create a Database](#1-create-a-database)
+- [Configure Database Settings](#2-configure-database-settings)
+- [Wait for Deployment](#3-wait-for-deployment)
+- [Connect to Your Database](#4-connect-to-your-database)
+  - [Using Command Line (CLI)](#using-command-line-cli)
+  - [Using pgAdmin (GUI)](#using-pgadmin-gui)
+
+(1-create-a-database)=
+## 1. Create a Database
+Navigate to the "Database" section and click the "New" button to start the creation process.
+
+![Create a new database](../static/db-new.png)
+
+(2-configure-database-settings)=
+## 2. Configure Database Settings
+Configure your database by providing the following information:
+- Database name
+- Username
+- Password
+- Hardware specifications (optional)
+
+![Configure database settings](../static/db-enter-info.png)
+
+> ⚠️ **Important Security Note**  
+> Create a strong password that includes:
+> - Uppercase and lowercase letters
+> - Numbers
+> - Special characters
+> 
+> Store this password in a secure location - you'll need it to connect to your database.
+
+(3-wait-for-deployment)=
+## 3. Wait for Deployment
+The deployment process typically takes about 1 minute. You'll see a progress indicator, and once complete, your database status will change to "Running".
+
+![Database deployment status](../static/db-running.png)
+
+(4-connect-to-your-database)=
+## 4. Connect to Your Database
+Choose one of the following methods to connect to your database:
+
+(using-command-line-cli)=
+### Using Command Line (CLI)
+
+1. **Install the PostgreSQL client**
+   ```sh
+   # Ubuntu/Debian
+   sudo apt-get install postgresql-client
+
+   # macOS
+   brew install libpq
+   brew link --force libpq
+
+   # Windows
+   # Download from https://www.postgresql.org/download/windows/
+   ```
+
+2. **Connect using PSQL**
+   Copy the connection command from the UI and paste it into your terminal:
+   ```sh
+   psql -h {DATABASE-URL} -U {USERNAME} {DATABASE_NAME}
+   Password for user ...: {DATABASE_PASSWORD}
+   ```
+   ![PSQL connection details](../static/db-psql.png)
+
+3. **Test your connection**
+   Try creating a sample table:
+   ```sql
+   -- Create a users table
+   CREATE TABLE users (
+       id SERIAL PRIMARY KEY,
+       username VARCHAR(100) UNIQUE NOT NULL,
+       email VARCHAR(255) UNIQUE NOT NULL,
+       created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+   );
+
+   -- Add a test user
+   INSERT INTO users (username, email) 
+   VALUES ('testuser', 'test@example.com');
+
+   -- Verify the data
+   SELECT * FROM users;
+   ```
+
+(using-pgadmin-gui)=
+### Using pgAdmin (GUI)
+
+1. Launch pgAdmin on your computer
+2. In the browser panel, right-click "Servers" → "Create" → "Server..."
+3. Configure your connection:
+   | Tab | Field | Value |
+   |-----|-------|-------|
+   | General | Name | Your choice |
+   | Connection | Host | Your database URL |
+   | Connection | Port | 5432 |
+   | Connection | Database | Your database name |
+   | Connection | Username | Your database username |
+   | Connection | Password | Your database password |
+4. Click "Save" to establish the connection
+5. Your database will appear in the server list
+