energydb 0.4.1

Energy database: hierarchy + series metadata on Postgres, bitemporal I/O via timedb

⚡ EnergyDB

Persistent storage for energy portfolios — assets, grid topology, and bitemporal time series, in one connected database.

🏗️ What is EnergyDB?

EnergyDB is a database for energy portfolios. It stores three things together in one connected system:

Layer	Description	Real-World Example
🌳 Asset hierarchy	Arbitrary-depth tree of portfolios, sites, and assets	"Offshore-1 → WindTurbine T01 → power"
🔗 Grid topology	Typed edges (lines, transformers, pipes, interconnections) connecting any two assets	"Cable-1: BusA → BusB"
⏱️ Bitemporal time series	Actuals and versioned forecasts attached to any node or edge, queryable as-of any point in time	"power_flow on Cable-1, valid Wed 12:00, known Mon 18:00"

Structure lives in PostgreSQL, values live in ClickHouse, and stable UUID identity lets Python objects round-trip to the database without losing any structural state. (A separate change_time audit field tracks corrections without polluting the bitemporal model.)

EnergyDB extends TimeDB with persistent storage for EnergyDataModel hierarchies.

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✨ Why EnergyDB?

Most time-series systems are agnostic about what their series represent — they treat data as opaque (series_id, timestamp, value) triples. EnergyDB knows it is a portfolio, and links every series back to the asset or grid edge it describes.

• 🔁 Round-trip persistence: Every Element keeps its UUID7 from in-memory object to row primary key — renames, moves, and property edits become silent UPDATEs, never delete-then-insert.
• 📋 Diffable structural changes: dry_run=True previews every insert, rename, move, and delete before you apply — no surprise data loss on replace_subtree.
• ⏱️ Bitemporal queries: Forecast revisions, corrections, and time-of-knowledge backtests, powered by TimeDB.
• 🧭 Lazy fluent navigation: client.get_node("Portfolio", "Site", "T01").read(...) resolves to one indexed SQL query, regardless of subtree size.
• ⚖️ Unit conversion at the boundary: Declare canonical units once; pint rescales every read and write automatically.

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🚀 Quick Start

1. Installation

pip install energydb

Requires Python 3.12+, PostgreSQL (asset hierarchy + series catalog), and ClickHouse (time-series values).

2. Usage Example

from datetime import UTC, datetime

import energydb as edb
import pandas as pd

client = edb.Client()  # reads TIMEDB_PG_DSN / TIMEDB_CH_URL from env
client.create()        # PostgreSQL schema + ClickHouse series_values table

# 1. Declare a turbine and the series it will hold (metadata only).
t01 = edb.wind.WindTurbine(
    name="T01", lat=55.01, lon=3.02, capacity=3.5, hub_height=80,
    timeseries=[
        edb.TimeSeries(name="power", unit="MW",
                       data_type=edb.DataType.ACTUAL),
    ],
)

# 2. Wrap it in a site and a portfolio.
site = edb.Site(name="Offshore-1", lat=55.0, lon=3.0, members=[t01])
portfolio = edb.Portfolio(name="my-portfolio", members=[site])

# 3. Persist structure (nodes, edges, series declarations). Idempotent.
client.register_tree(portfolio)

# 4. Write a day of hourly values for the turbine's power series.
start = datetime(2026, 1, 1, tzinfo=UTC)
df = pd.DataFrame({
    "valid_time": pd.date_range(start, periods=24, freq="1h", tz="UTC"),
    "value": [2.5 + 0.05 * i for i in range(24)],
})
client.get_node("my-portfolio", "Offshore-1", "T01").write(
    df, name="power", data_type="actual",
)

# 5. Read back — single asset, or across the whole portfolio.
client.get_node("my-portfolio", "Offshore-1", "T01").read(name="power", data_type="actual")
client.get_node("my-portfolio").read(name="power", data_type="actual")

# 6. Reconstruct the full EDM tree from the database.
tree = client.get_tree("my-portfolio", include_series=True)

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🧪 Try it in Google Colab

Want to try EnergyDB without a local setup? Open our Quickstart in Colab — the first cell automatically installs PostgreSQL + ClickHouse inside the VM.

Note: Data persists only within the active Colab session. Additional notebooks are available in the examples/ directory.

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📚 Documentation & Resources

• 📖 Official Documentation
• ⚙️ Installation Guide
• 🐍 Python SDK Documentation
• 🌐 Reference
• 💡 Examples & Notebooks

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📦 Related Projects

Project	Description
TimeDB	Bitemporal time-series database with auditability and overlapping-forecast support
TimeDataModel	Pythonic data model for time series
EnergyDataModel	Data model for energy assets (solar, wind, battery, grid, ...)

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🤝 Contributing

Contributions are welcome! If you're interested in improving EnergyDB, please see our Development Guide for local setup instructions.

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Licensed under the Apache-2.0 License.

Find a bug or have a feature request? Open an Issue.