Primary platform DB. Decisions, sessions, tasks, list_items, file_events. Whitelisted in backend/.htaccess. Auth: token param.

Inter-system broadcast and messaging. drop with targets=ALL for platform-wide broadcasts. pickup auto-marks SEEN. system param = decade code.

Point-to-point inter-system transfers. from_system and to_system use decade codes. D075: hold on pickup until close.

Saves gov/ files per system. file = relative path from system dir (e.g. gov/handoff-00.md). Validates system code. Returns ok + saved_at timestamp.

Writes any file to public_html. WAF may block PHP keywords in content — use WAF bootstrap pattern (write b64 as .txt, decode + include via bootstrapper). Required for all server-side file deployment.

Reads all 22 platform error_logs from their source locations. read_all returns metadata for all. read returns last 200 lines of a specific log. clear wipes a log file. Path-whitelist protected.

DB Admin read API. Requires browser session cookie — no token auth. Use DB Admin Panel at backend/tools/db-admin.html. Cannot be called via curl.

DB Admin write API. Requires browser session cookie. Use DB Admin Panel only.

Search cache and media log. Backed by backend/web/db/search.db. Used by web-fetch.php.

Each system has its own api.php at systems/[NN]-[name]/data/api.php. D267: system DBs are source of truth for full decision and session detail. records.db holds slim reference rows only. Note: some system DBs return HTTP 500 on POST — workaround: direct SQLite writes via bootstrap PHP.

Tech [30] Factory app API. Manages script and template library.

Tech [30] Creators app API.

Tech [30] Laboratory API. Experimental scripts and templates.

Tech [30] app database API. 30-app.db.