docs(production-readiness): P1 — Authoritative Database Baseline verification

[mdtazizulislam]

Summary

Production Readiness · P1 — Authoritative Database Baseline. Evidence-based verification of the whole baseline chain (PR #248 → PR #250), executed on a throwaway local PostgreSQL 16 cluster created and destroyed in-session. Production was never touched. Docs-only — one report file.

What was verified (measured, not asserted):

1. PR Phase 3B baseline replacement plan — supersedes PR #248 (docs only) #250's drift finding independently corroborated. PR [SUPERSEDED by #250] Phase 3B promotion execution prep — 0000_prod_baseline (B1) #248's initDatabase()-derived candidate baseline was re-materialized and counted with the operator's exact catalog queries: 125 tables / 1595 columns / 400 indexes / 275 non-PK / 267 FKs — every candidate-side number in the drift table reproduces exactly, re-confirming the ~54-column shortfall vs production's measured 1649 and the roadmap rule: never use the initDatabase baseline.
2. Guards hold on main: db:migrate is inert (no meta/_journal.json in the live migrations dir — migrate.ts skips), no prod-baseline directory is merged, the 39-table baseline-preview stays quarantined, and mark-as-applied has not occurred anywhere. Also documented: initDatabase() remains the runtime schema source (index.ts:7451 → db.ts:122, 132 CREATE TABLEs) — the drift engine itself.
3. New finding — runbook amendment for PR Phase 3B baseline replacement plan — supersedes PR #248 (docs only) #250: its Step 2 artifact fix ("grep for int4_ops") is too narrow. The candidate contains 149 wrong-opclass tokens in at least three forms, including text_ops on timestamptz (line 2302), which a grep for int4_ops misses and which hard-fails on apply — reproduced in-session (ERROR: operator class "text_ops" does not accept data type timestamp with time zone). Amendment: normalize all explicit <type>_ops tokens; the fully-normalized DDL applied cleanly with ON_ERROR_STOP=1.
4. Hard gates documented honestly: the Gate 1 production snapshot is operator-held (no schema dump exists in-tree — verified by search), and PG18 requires Docker (no daemon in this environment; local server is PG 16.13). So "verify against production snapshot" and "produce final authoritative baseline" are operator-executed steps — fabricating the baseline from in-repo sources would repeat the PR [SUPERSEDED by #250] Phase 3B promotion execution prep — 0000_prod_baseline (B1) #248 error and was explicitly not done.

Verdict + exact remaining path (in the report): merge PR #250 as plan of record (pending approval) → close PR #248 as superseded → operator executes the amended replacement runbook on PG18 with the real snapshot → commit the 1649-column authoritative baseline + journal + drift inventory → P2 picks up from there.

Type of Change

• Documentation update
• Bug fix
• Feature
• Refactor
• Build/Tooling

Scope

• Shared packages
• Core runtime services
• AI services
• Dashboard/UI
• Infrastructure/DevOps

(Docs-only — verification report; no code, no migrations, no schema changes.)

Validation

# Reproduction on throwaway PG16 (created + destroyed in-session):
candidate: origin/docs/phase3b-promotion-exec …/prod-baseline/0000_prod_baseline.sql (166,833 B)
normalize: strip all /\s+[a-z0-9_]+_ops\b/ (149 tokens) → psql ON_ERROR_STOP=1 → clean
counts   : tables 125 · columns 1595 · pg_indexes 400 · non-PK 275 · FKs 267  (exact match to PR #250)
negative : without full normalization, apply aborts at line 2302 (text_ops on timestamptz)

# Guard checks on main @ 8360c50:
- packages/db-client/src/postgres/migrations/meta/_journal.json → absent → migrate.ts skips
- no prod-baseline dir on main; baseline-preview = 39 tables (quarantined)
- initDatabase() live at apps/backend/src/index.ts:7451

# This PR's diff: 1 markdown file, 0 code changes

Checklist

• Non-breaking changes only (docs-only)
• No secrets committed
• README/docs updated when behavior changes (the P1 report)
• Verification proof included (evidence log embedded)
• Optional service impact explicitly called out (none)

🤖 Generated with Claude Code

https://claude.ai/code/session_01MMnfvQvtgNQwiUvPJ4ff8Z

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