Weiser

Data Quality Framework

Introduction

Weiser is a data quality framework designed to help you ensure the integrity and accuracy of your data. It provides a set of tools and checks to validate your data and detect anomalies. It also includes a dashboard to visualize the results of the checks.

Installation

To install Weiser, use the following command:

pip install weiser-ai

Usage

Run example checks

Connections are defined at the datasources section in the config file see: examples/example.yaml.

Run checks in verbose mode:

weiser run examples/example.yaml -v

Watch the CLI Demo

Compile checks only in verbose mode:

weiser compile examples/example.yaml -v

Run dashboard

cd weiser-ui
pip install -r requirements.txt
streamlit run app.py

Watch the Dashboard Demo

Configuration

Simple count check defintion

- name: test row_count
  dataset: orders
  type: row_count
  condition: gt
  threshold: 0

Custom sql definition

- name: test numeric
  dataset: orders
  type: numeric
  measure: sum(budgeted_amount::numeric::float)
  condition: gt
  threshold: 0

Target multiple datasets with the same check definition

- name: test row_count
  dataset: [orders, vendors]
  type: row_count
  condition: gt
  threshold: 0

Check individual group by values in a check

- name: test row_count groupby
  dataset: vendors
  type: row_count
  dimensions:
    - tenant_id
  condition: gt
  threshold: 0

Time aggregation check with granularity

- name: test numeric gt sum yearly
  dataset: orders
  type: sum
  measure: budgeted_amount::numeric::float
  condition: gt
  threshold: 0
  time_dimension:
    name: _updated_at
    granularity: year

Custom SQL expression for dataset and filter usage

- name: test numeric completed
  dataset: >
    SELECT * FROM orders o LEFT JOIN orders_status os ON o.order_id = os.order_id
  type: numeric
  measure: sum(budgeted_amount::numeric::float)
  condition: gt
  threshold: 0
  filter: status = 'FULFILLED'

Missing values check

- name: customer data quality
  dataset: orders
  type: not_empty
  dimensions: ["customer_id", "product_id", "order_date"]
  condition: le
  # Allow up to 5 NULL values per dimension
  threshold: 5
  filter: "status = 'active'"

Anomaly detection check

- name: test anomaly
  # anomaly test should always target metrics metadata dataset
  dataset: metrics
  type: anomaly
  # References Orders row count.
  check_id: c5cee10898e30edd1c0dde3f24966b4c47890fcf247e5b630c2c156f7ac7ba22
  condition: between
  # long tails of normal distribution for Z-score.
  threshold: [-3.5, 3.5]

Contributing

We welcome contributions!

License

This project is licensed under the Apache 2.0 License. See the LICENSE file for more details.

Project links

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Credits

Author/Maintainer: Paco Valdez

GitHub Statistics

Data verified by PyPI on Aug 19, 2026
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License expression

MIT
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Requires

Python >=3.10

Tags

data-quality data-validation data-testing sql yaml llm ai eval

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