feat(backend): add the db connection

backend/.gitignore

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+# --------------------------------------------------------------
+# Python / FastAPI core
+# --------------------------------------------------------------
+
+# Byte‑compiled / optimized Python files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+build/
+dist/
+*.egg-info/
+*.egg
+*.whl
+pip-wheel-metadata/
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+*.gcov
+*.gcda
+*.gcno
+.pytest_cache/
+pytestdebug.log
+
+# Jupyter / IPython
+.ipynb_checkpoints
+profile_default/
+ipython_config.py
+
+# --------------------------------------------------------------
+# Virtual environments & environment files
+# --------------------------------------------------------------
+
+# Virtualenv / venv / conda environments
+env/
+venv/
+ENV/
+VENV/
+.venv/
+.pyenv/
+conda-env/
+conda-requirements.txt
+
+# Environment variable files (keep secrets out of VCS)
+.env
+.env.*               # e.g. .env.dev, .env.prod
+.envrc
+.env.local
+.env.development
+.env.production
+
+# --------------------------------------------------------------
+# FastAPI / ASGI / Uvicorn specifics
+# --------------------------------------------------------------
+
+# Uvicorn log files (if you redirect logs to files)
+uvicorn.log
+uvicorn-access.log
+
+# FastAPI generated OpenAPI / Swagger UI files (if you commit them)
+openapi.json
+swagger.json
+
+# --------------------------------------------------------------
+# Database / Alembic migrations
+# --------------------------------------------------------------
+
+# SQLite database files (often used in dev)
+*.sqlite3
+*.db
+*.db-journal
+
+# Alembic migration scripts (keep the folder but ignore compiled artifacts)
+alembic/versions/*.pyc
+alembic/versions/__pycache__/
+
+# --------------------------------------------------------------
+# Static & media assets
+# --------------------------------------------------------------
+
+# Uploads / generated media (usually served by a CDN or separate storage)
+media/
+uploads/
+staticfiles/
+static/   # keep if you have a folder you *do* want committed, otherwise ignore sub‑folders
+
+# --------------------------------------------------------------
+# Docker / CI / Deployment
+# --------------------------------------------------------------
+
+# Docker files that you might generate locally
+docker-compose.override.yml
+Dockerfile.dev
+
+# Docker volumes / data
+docker-data/
+.docker/
+
+# GitHub Actions / CI caches
+.github/workflows/*.log
+
+# --------------------------------------------------------------
+# IDE / Editor specific
+# --------------------------------------------------------------
+
+# VS Code
+.vscode/
+# PyCharm / IntelliJ
+.idea/
+*.iml
+*.iws
+*.ipr
+# Sublime Text
+*.sublime-project
+*.sublime-workspace
+# Eclipse / VS
+.project
+.pydevproject
+# Emacs / Vim
+*~
+\#*\#
+.*.swp
+.*.swo
+.#*
+.session
+*.un~
+*.orig
+*.bak
+*.tmp
+
+# --------------------------------------------------------------
+# OS generated files
+# --------------------------------------------------------------
+
+# macOS
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Windows
+Thumbs.db
+ehthumbs.db
+Desktop.ini
+$RECYCLE.BIN/
+
+# Linux
+*~
+.nfs*
+
+# --------------------------------------------------------------
+# Miscellaneous
+# --------------------------------------------------------------
+
+# Logs
+*.log
+log/
+logs/
+
+# Documentation build artifacts (Sphinx, MkDocs, etc.)
+docs/_build/
+site/
+
+# Backup files
+*.bak
+*.backup
+*.old
+
+# sqlite db
+database.db
+database.db-journal