Add backend code

.github/workflows/release.yml

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+name: Release to PyPI
+on:
+  release:
+    types: [published]
+  push:
+    tags:
+      - v*.*.*
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+      - name: Install Poetry
+        uses: abatilo/[email protected]
+        with:
+          poetry-version: 1.2
+      - name: Verify versioning
+        run: |
+          [ "$(poetry version -s)" == "${GITHUB_REF#refs/tags/v}" ]
+      - name: Install dependencies
+        run: poetry install
+      - name: Run tests
+        run: poetry run pytest
+      - name: Build packages
+        run: poetry build
+      - name: Configure Poetry
+        run: |
+          poetry config repositories.testpypi https://test.pypi.org/legacy/
+          poetry config pypi-token.testpypi ${{ secrets.TEST_PYPI_API_TOKEN }}
+          poetry config pypi-token.pypi "${{ secrets.PYPI_API_TOKEN }}"
+      - name: Publish to test PyPI
+        if: ${{ github.event_name == 'push' }}
+        run: poetry publish -r testpypi
+      - name: Publish to PyPI
+        if: ${{ github.event_name == 'release' }}
+        run: poetry publish

.github/workflows/test.yml

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+name: Test
+on:
+  push:
+    branches: [ "*" ]
+  pull_request:
+    branches: [ "*" ]
+  workflow_dispatch:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ 'ubuntu-20.04' ]
+        python-version: [ '3.8', '3.9', '3.10' ]
+        poetry-version: [ '1.2' ]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install Poetry
+        uses: abatilo/[email protected]
+        with:
+          poetry-version: ${{ matrix.poetry-version }}
+      - name: Install dependencies
+        run: poetry install
+      - name: Run tests
+        run: poetry run pytest --cov=sigma --cov-report term --cov-report xml:cov.xml -vv
+      - name: Store coverage for badge
+        if: ${{ runner.os == 'Linux' }}
+        run: poetry run python print-coverage.py >> $GITHUB_ENV
+      - name: Create coverage badge
+        if: ${{ github.repository == 'wagga40/pySigma-backend-sqlite' && github.event_name == 'push' && runner.os == 'Linux' }}
+        uses: schneegans/[email protected]
+        with:
+          auth: ${{ secrets.GIST_SECRET }}
+          gistID: GitHub Gist identifier containing coverage badge JSON expected by shields.io.
+          filename: wagga40-pySigma-backend-sqlite.json
+          label: Coverage
+          message: ${{ env.COVERAGE }}
+          color: ${{ env.COVERAGE_COLOR }}

.gitignore

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+.coverage*
+.vscode/
+**/__pycache__
+.pytest_cache/
+cov.xml
+dist/
+docs/_build
+.venv/
+
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+docs/site
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+/venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+.vscode/
+caches/
+.idea/
+__pypackages__
+.pdm.toml
+.pdm-python
+temp.py
+
+# Pyannotate generated stubs
+type_info.json
+.pdm-build/
+src/pdm/models/VERSION