feat(insights): Phase C — Sentry issues + events archive

Mirrors Sentry into our DB before the free tier prunes events (~30d).

- `SentryIssue` (aggregate state, upserted to latest) + `SentryEvent`
  (raw occurrences, lossless full payload JSONB, dedup by eventId, cold
  dump to MinIO `sentry-archive/{project}/YYYY/MM/DD.jsonl.gz`).
- `lib/sentry.ts`: read-only client, Link-header cursor pagination,
  listIssuesPage / listEventsPage. EU-region aware (SENTRY_API_BASE).
- `sentry-archive` job @hourly: issues upsert + events newest-first with
  skipDuplicates, stops once a page is all-duplicates (caught up).
- Config via env: SENTRY_AUTH_TOKEN / SENTRY_ORG / SENTRY_PROJECT /
  SENTRY_API_BASE.

Verified live against otolog/python (EU): a test event archived on run 1,
0 inserts / 1 duplicate on run 2 (dedup), issue upserted idempotently.

Note: Sase API currently sends to an inaccessible org's DSN (hardcoded
fallback); repointing SENTRY_DSN to otolog/python is a separate deploy step.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/prisma/schema.prisma

@@ -508,3 +508,51 @@ model PosthogCohortSnapshot {
   @@index([projectKey, capturedAt])
   @@map("posthog_cohort_snapshots")
 }
+
+// ---------- Phase C: Sentry archive ----------
+
+// Sentry issue (group) aggregate state. Upserted to the latest snapshot — the
+// raw history lives in SentryEvent; the issue row is the current grouping/metadata.
+model SentryIssue {
+  id           String   @id          // Sentry issue/group id
+  projectKey   String                // "sase"
+  shortId      String?
+  title        String?
+  culprit      String?
+  level        String?
+  status       String?
+  type         String?
+  count        Int?                  // total events as of lastSyncedAt
+  userCount    Int?
+  firstSeen    DateTime?
+  lastSeen     DateTime?
+  permalink    String?
+  metadata     Json?
+  ingestedAt   DateTime @default(now())
+  lastSyncedAt DateTime @default(now())
+
+  @@index([projectKey, lastSeen])
+  @@map("sentry_issues")
+}
+
+// Individual Sentry events (the at-risk raw occurrences; free tier prunes ~30d).
+// Lossless full payload as JSONB; also cold-dumped to MinIO.
+model SentryEvent {
+  eventId     String   @id          // Sentry event id (32 hex)
+  issueId     String?               // parent issue/group id
+  projectKey  String
+  title       String?
+  message     String?
+  level       String?
+  platform    String?
+  timestamp   DateTime               // event occurrence time
+  tags        Json?
+  payload     Json                   // full event payload — lossless
+  ingestedAt  DateTime @default(now())
+  dumpedAt    DateTime?
+
+  @@index([projectKey, timestamp])
+  @@index([issueId, timestamp])
+  @@index([dumpedAt])
+  @@map("sentry_events")
+}