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 postgresql15 postgresql16.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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