added notebook investigating boiler power usage

pyproject.toml

@@ -0,0 +1,40 @@
+[project]
+name = "home-assistant"
+version = "0.1.0"
+description = "Data analysis notebooks for Home Assistant smart home metrics"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    "jupyter>=1.0.0",
+    "pandas>=2.0.0",
+    "matplotlib>=3.7.0",
+    "seaborn>=0.13.0",
+    "psycopg2-binary>=2.9.0",
+    "sqlalchemy>=2.0.0",
+    "python-dotenv>=1.0.0",
+    "ipykernel>=6.25.0",
+    "pandera>=0.28.1",
+    "plotly>=6.5.2",
+]
+
+[project.optional-dependencies]
+dev = [
+    "ruff>=0.1.0",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["utils"]
+
+[tool.ruff]
+line-length = 100
+target-version = "py312"
+
+[dependency-groups]
+dev = [
+    "pandas-stubs>=2.3.3.260113",
+    "ruff>=0.14.14",
+]