Track all prompts and outputs in a secure database for compliance

A defensible LLM audit-log system in PostgreSQL should separate immutable interaction metadata from encrypted prompt and response payloads, allowing organizations to retain evidence of model activity while meeting privacy and deletion obligations. The design uses time-based partitions for efficient retention through partition drops, append-only permissions that give application roles INSERT access without ownership or modification rights, row-level and column-level security to limit tenant and auditor access, and externally signed row digests to detect retroactive changes that database permissions alone cannot prevent. Prompt and response data are encrypted in the application with per-user or per-tenant keys, enabling cryptographic erasure by destroying a key while preserving non-sensitive metadata such as timestamps, model versions, policy context, statuses, and request identifiers. The approach also emphasizes dedicated audit database ownership, careful partition maintenance, legal holds, backups and key-destruction procedures, storage planning, and avoiding sensitive content in service logs, while placing content analysis, abuse detection, and PII monitoring in a separate redacted safety-monitoring pipeline.

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