Docs half of website PR 3 (phase 2). MODULE_SYSTEM.md 2.7 gains the PR 3 entry;
MODULE_API.md 2.6 gains the decisions the section did not previously answer.
The one that shapes the code: a fragment is VALIDATED at load time and EXECUTED
later, split on whether a database is needed to know the answer. Everything 2.6
states about the SQL is knowable by reading the file, so breaking one of those
rules costs a module its mount entirely rather than mounting and 503ing with its
tables half created. What is left for the replay is the class of failure only
the server can report, and that is post-mount and answers 503.
Also recorded: the rules are enforced as a leading-verb allowlist (CREATE,
ALTER, INSERT, UPDATE -- the four core's own schema.sql uses) rather than the
DROP denylist 2.6 words them as, because the file is replayed on every boot and
a denylist only ever bans what somebody thought of; the replay sits outside
ensureSchema's wait-for-the-database retry loop, so one module's bad SQL cannot
cost the boot two minutes; partial application is accepted, since MariaDB
self-commits DDL and no transaction could undo it; and `npm run seed` is the one
sanctioned caller that replays nothing, because it never requires app.js and so
has no scan to read.
Co-Authored-By: Claude <noreply@anthropic.com>
