The first storage cut modelled two side tables as free-form blobs. This
replaces both with opinionated, statically-typed schema so what a session
can carry is fixed by the schema, not by convention.
session_metadata: was a (session_id, key, value) KV bag with six
convention-only keys. Now a 1:1 table of named, typed columns. The domain
currency is a typed domain.SessionMetadata struct (was map[string]string),
threaded through ports.LifecycleStore, the LCM, the Session Manager and the
reaper, so an unknown key is a compile error rather than a silently-dropped
write. PatchMetadata keeps its non-destructive merge ("empty = leave
unchanged"). The off-canonical invariant is now enforced at the type level
via json:"-" on SessionRecord.Metadata, removing the manual `Metadata = nil`
scrub the change_log/snapshot paths had to remember; the Meta* string-key
constants are deleted.
pr_enrichment -> pr (+ pr_check, pr_comment): the scalar facts are now
typed columns with CHECK-constrained enums (review_decision, mergeability,
ci_state) and integer CI counts instead of opaque TEXT. The two list facts
the old `pending_comments`/ci_summary strings smuggled are normalized into
child tables (pr_check, pr_comment) that cascade from pr. The store exposes
UpsertPR/GetPR plus atomic ReplacePRChecks/ReplacePRComments + List.
Both tables remain off the canonical CDC path. sqlc regenerated; migrations
0001/0002 revised in place (nothing released). gofmt/vet clean; go test
-race green; daemon smoke-boots and creates the new schema.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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