ai_tool_credit_rates

Effective-dated credit pricing for credit-billed AI tools. Each row sets the rate that applies from its effective_at date until the next row's effective_at, so historical spend is not repriced when the rate changes.

id

Primary key

Unique identifier for the row.

ai_tool_id

Foreign key

ID of the AI tool this rate applies to.

cost_per_credit

number

USD dollars per credit from effective_at onwards. NULL explicitly ends credit pricing from that date, leaving spend unknown rather than zero.

effective_at

date

The date this rate starts applying. Usage before the earliest rate is not priced.