Phillip Tarrant 0306f71763 feat: phase 2 content model + cache — SQLite schema, markdown, TTL ...

Stand up the full SQLite content layer: all 7 tables from the authoritative
schema with WAL + foreign-keys enforced per-connection, entity dataclasses
plus row mappers, hand-rolled versioned migrations tracked in
schema_migrations, and an idempotent Python seed (system user + welcome
post + About page).

Add a Markdown->HTML service using markdown-it-py with a strict bleach
allowlist (tables intentionally omitted on both sides). Add a typed
in-process TTLCache[K,V] and wire it into real DB-backed PostService and
PageService, both exposing invalidate_all() for Phase 4 admin writes.

Rewire / and /about to read from the DB; homepage renders the seeded
welcome post, About renders page.title + sanitized body_html_cached.
Update the Phase 1 route tests accordingly.

Mark Phase 2 complete in docs/ROADMAP.md.

2026-04-21 15:40:35 -05:00

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