# Feature Store Specification

> Use this template to feature definitions and serving rules for [ML feature set].

## Template Metadata

| Field | Details |
|-------|---------|
| Category | Data, AI & Analytics |
| Owner | [Team or owner] |
| Version | [Version number] |
| Effective Date | [Date] |
| Review Cycle | [Monthly / Quarterly / Annual / Event-based] |
| Status | [Draft / In Review / Approved] |

## Feature Set Overview

Describe model use case, owner, freshness requirements, and consumers.

| Item | Details | Owner | Status |
|------|---------|-------|--------|
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |

### Notes

[Add context, assumptions, exceptions, evidence links, screenshots, calculations, or reviewer comments.]

## Entities

Define entity keys, grain, join keys, and point-in-time correctness requirements.

| Item | Details | Owner | Status |
|------|---------|-------|--------|
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |

### Notes

[Add context, assumptions, exceptions, evidence links, screenshots, calculations, or reviewer comments.]

## Feature Definitions

Create a table with Feature, Type, Definition, Window, Source, and Null Handling.

| Item | Details | Owner | Status |
|------|---------|-------|--------|
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |

### Notes

[Add context, assumptions, exceptions, evidence links, screenshots, calculations, or reviewer comments.]

## Transformations

Document calculation logic, filters, aggregations, and leakage controls.

| Item | Details | Owner | Status |
|------|---------|-------|--------|
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |

### Notes

[Add context, assumptions, exceptions, evidence links, screenshots, calculations, or reviewer comments.]

## Serving

Describe offline and online serving paths, latency targets, and access patterns.

| Item | Details | Owner | Status |
|------|---------|-------|--------|
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |

### Notes

[Add context, assumptions, exceptions, evidence links, screenshots, calculations, or reviewer comments.]

## Backfill

Give historical rebuild steps, validation checks, and rollback criteria.

| Item | Details | Owner | Status |
|------|---------|-------|--------|
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |

### Notes

[Add context, assumptions, exceptions, evidence links, screenshots, calculations, or reviewer comments.]

## Monitoring

Define freshness, distribution, null-rate, and drift alerts. Use Markdown tables and pseudocode where helpful.

| Item | Details | Owner | Status |
|------|---------|-------|--------|
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |
| [Item or requirement] | [Describe the relevant detail, evidence, or decision] | [Owner] | [Open / Complete] |

### Notes

[Add context, assumptions, exceptions, evidence links, screenshots, calculations, or reviewer comments.]

## Review and Signoff

Document review conclusions, approvals, unresolved items, and next review date.

| Role | Name | Date | Notes |
|------|------|------|-------|
| Preparer | [Name] | [Date] | [Notes] |
| Reviewer | [Name] | [Date] | [Notes] |
| Approver | [Name] | [Date] | [Notes] |