Postgresql integration

[Denes-cilwal]

This pull request migrates the codebase from MySQL to PostgreSQL, refactors environment variable usage, and updates related configuration, infrastructure, and dependency files. The changes ensure compatibility with PostgreSQL, improve environment config structure, and update Docker and migration tooling accordingly.

Database Migration and Configuration Updates:

• Migrated from MySQL to PostgreSQL across the codebase, including .env.example, docker-compose.yml, atlas.hcl, and migration files. Updated environment variables and connection ports to match PostgreSQL conventions. [1] [2] [3] [4] [5] [6]
• Refactored pkg/infrastructure/db.go to use PostgreSQL driver, add validation for database names, and implement logic for creating/checking the target database in PostgreSQL. The database connection setup now uses gorm.io/driver/postgres.

Dependency and Tooling Updates:

• Updated Go dependencies in go.mod to use gorm.io/driver/postgres instead of MySQL, removed direct MySQL driver dependency, and adjusted indirect dependencies accordingly. [1] [2] [3] [4]
• Updated migration tooling in Makefile to use PostgreSQL connection strings and Atlas migration commands compatible with PostgreSQL.

Environment and Configuration Refactoring:

• Refactored pkg/framework/env.go to group environment variables into structured config types (ServerConfig, DatabaseConfig, SentryConfig, AWSConfig, AdminConfig), and updated usage throughout the codebase for improved clarity and maintainability. [1] [2] [3] [4]

Codebase Adjustments for PostgreSQL:

• Updated model definitions and removed MySQL-specific fields and logic (e.g., UUID field and its BeforeCreate hook in domain/models/user.go). [1] [2]
• Updated repository and service constructors to use pointer types for the new database struct. [1] [2]

Docker and Service Orchestration:

• Replaced MySQL service with PostgreSQL in docker-compose.yml, updated health checks, and adjusted service dependencies and networks. Updated Adminer configuration for PostgreSQL. [1] [2]

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References:
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21]

[paudelgaurav]

@Denes-cilwal Let's use uuid as PK.