ADR-0003: Bill by unique source databases (relocated)

Status

Accepted — 2026-05-28. Relocated to the private privaci-commercial repository — 2026-06-11 (ADR-0007 placement policy; init-privaci-engine task §18.7.2).

Summary

This decision covers the commercial billing dimension — how the proprietary layer counts unique source databases and maps them to Marketplace pricing tiers. That is business-model material, so per ADR-0007 it lives in the private privaci-commercial repository, not in this public engine repo. The ADR number is retained here as a tombstone for traceability.

What stays in the public engine

The engine computes and persists a stable source_db_hash (sha256(host:port/dbname)) on every run, recorded in _privaci.runs. This supports run identity and resumability and is specified by the engine's state-and-audit capability. How any commercial layer aggregates those hashes for metering or tiering is out of scope for the public engine.

See ADR-0004 for why run state (including source_db_hash) lives in the target database.