Config Schema Inventory & DSL Type Coverage

Reference for the {slug}_config enum inventory (product-level scale) and the setting_type DSL implementation coverage in middag-io/moodle. Backs MDL-012.

Legacy config-key inventory (product-level, local_middag)

This inventory belongs to the consumer product (local_middag's own extensions), not to this OSS adapter — it is reproduced here as the historical scale the config-schema mechanism was built to support.

Metric	Count
Extensions with a {slug}_config enum (of 12 product extensions total)	10
Keys with storage	60
storedfile keys	3
multiselect keys	1
Lazy keys (is_lazy() === true)	6

Extensions covered: core, ecommerce, videolibrary, automessage, bigquery, opengraph, cleaner, sentry, coursegroup, helpdesk.

• core has the largest enum, 15 keys — including authprofilefield (lazy, resolved via user_support::get_options_for_user_fields()) and authsecretkey (password type).
• bigquery has the largest concentration of lazy options (4), related to data retention and mode selection.

DSL type coverage

setting_type covers 22 variants total (19 with storage, plus 3 display-only: heading, description, link). The legacy plugin (ref-312-01, 2026-04-09) had only 8 implemented, with 14 reserved-but-unimplemented. This adapter has since closed that gap — verified against real code on 2026-07-17, src/Settings/Type/ now contains all 22.

Setting type	Legacy (ref-312-01, 2026-04-09)	This adapter (verified 2026-07-17)
text	implemented	implemented
checkbox	implemented	implemented
select	implemented	implemented
password	implemented	implemented
textarea	implemented	implemented
heading	implemented	implemented
description	implemented	implemented
link	implemented	implemented
autocomplete	reserved, unimplemented	implemented — Autocomplete.php
encrypted_password	reserved, unimplemented	implemented — EncryptedPassword.php
htmleditor	reserved, unimplemented	implemented — Htmleditor.php
colourpicker	reserved, unimplemented	implemented — Colourpicker.php
duration	reserved, unimplemented	implemented — Duration.php
time	reserved, unimplemented	implemented — Time.php
multicheckbox	reserved, unimplemented	implemented — Multicheckbox.php
multiselect	reserved, unimplemented	implemented — Multiselect.php
storedfile	reserved, unimplemented	implemented — Storedfile.php
filepath	reserved, unimplemented	implemented — Filepath.php
directory	reserved, unimplemented	implemented — Directory.php
executable	reserved, unimplemented	implemented — Executable.php
iplist	reserved, unimplemented	implemented — Iplist.php
portlist	reserved, unimplemented	implemented — Portlist.php
Total	8 / 22	22 / 22

This closes the gap the legacy ADR/REF pair documented as open — a genuine forward-progress finding, not a contradiction to flag as debt.

Anti-patterns

Anti-pattern	Why it's wrong
Using get_config() directly	Bypasses the typed schema — reads should go through config_support/settings_support.
Putting resolution logic in the {slug}_config enum	The enum must stay pure metadata; resolution logic belongs to the DSL/services layer.
Creating a config key with no matching enum case	Produces a "ghost" key that never appears in the schema.
Registering lazy options during register()	Services are not available at that phase (boot) — see the routing/lifecycle note below.

Related

• MDL-011 — Admin Settings: Typed DSL Is the Only Interface — the settings declaration/registration lifecycle this schema plugs into; the boot-phase restriction on registering lazy options comes from that same lifecycle.
• MDL-003 — Support Layer Pattern — settings_support (the runtime API backed by this schema) is one of the *_support classes this pattern governs.