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FabledScribe/alembic/versions
bvandeusenandClaude Opus 5 6ddb8bf859
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feat(rules): a rule can say when it applies, which area it is about, and what it belongs with (#3029, milestone 307 step 3, schema)
A rule could not state its trigger, its area, or its siblings, so all three
were being written as prose instead: a System's charter restating rule text,
a `why` naming the note that caused it, and two halves of one shape merged
into a single row because either could surface without the other.

Migration 0088 adds the four fields those workarounds stood in for:

- `when_to_apply` — the trigger. Nullable in the DB and required at the
  service layer: existing rules have none and a migration cannot invent one.
- `tier` — always_on | conditional, defaulting to always_on. This migration
  therefore changes NOTHING about which rules bind; an install upgrades and
  every rule keeps arriving exactly as before. Getting that backwards is the
  one failure this milestone exists to prevent, so _valid_tier falls back to
  always_on rather than silently un-binding a rule with a typo'd tier.
- `arose_from_id` — the record that caused the rule, the edge notes and tasks
  already have. SET NULL: trashing the source does not repeal the rule.
- `rule_systems` / `rule_relations` — the canon tag and the typed edges
  (co_surfaces / overrides / elaborates), each earned from a workaround its
  absence forced.

rule_brief() replaces the THREE hand-written trim dicts that had already
diverged — two carried topic_id, one didn't, and none carried the timestamps
the model has held all along. That omission is why a rule written before the
capability it duplicates was indistinguishable at read time from one still
doing work. It now carries updated_at as a DATE: the question is "how old is
this", and a full stamp across the always-on set is ~2k characters for
precision nobody reads. The two callers select the ENTITY rather than a column
list, so rule_brief stays the single place deciding what a surfaced rule says.

Backup: both new tables carried, area tags by canonical SLUG (ids are
per-install). The rule-relation restore runs after ALL rules exist and after
the catalog, because an edge names two rules and a tag names a global row —
sections renumbered so the file reads in dependency order. A pre-0088 payload
restores with tier=always_on, i.e. binding exactly as when it was taken.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-26 14:11:32 -04:00
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