Description of the issue:

• Build is failing during the Nixpacks setup phase
• Error occurs when trying to install PostgreSQL development packages
• Multiple nixpacks.toml configurations attempted without success

Error message:

error: attribute 'dev' missing

at /app/.nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix:19:31:

gcc gcc postgresql_15 postgresql_16.dev python39 python39

Build/Deploy logs:

[Attached full error log from previous deployment]

Current configuration:

1. nixpacks.toml setup:

• Using Python 3.9
• PostgreSQL integration
• Basic gcc compiler

Environment:

• Railway deployment platform
• PostgreSQL addon enabled
• Custom start command: "alembic upgrade head && uvicorn app.main:app --host 0.0.0.0 --port 8080"

Attempted solutions:

1. Modified nixpacks.toml with various PostgreSQL package combinations
2. Added system-level dependencies through aptPkgs
3. Tried different PostgreSQL version specifications

GitHub repo/code:

[Your repository URL here]

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