task ep.1.4.1

src/db/schema.ts

@@ -467,6 +467,9 @@ export const businessEventOutbox = pgTable(
     deliveryStatus: text('delivery_status').default('pending').notNull(),
     attemptCount: integer('attempt_count').default(0).notNull(),
     availableAt: timestamp('available_at', { withTimezone: true }).defaultNow().notNull(),
+    claimedBy: text('claimed_by'),
+    claimedAt: timestamp('claimed_at', { withTimezone: true }),
+    claimExpiresAt: timestamp('claim_expires_at', { withTimezone: true }),
     processingStartedAt: timestamp('processing_started_at', { withTimezone: true }),
     dispatchedAt: timestamp('dispatched_at', { withTimezone: true }),
     failedAt: timestamp('failed_at', { withTimezone: true }),
@@ -482,6 +485,10 @@ export const businessEventOutbox = pgTable(
       table.deliveryStatus,
       table.availableAt
     ),
+    claimLeaseIdx: index('business_event_outbox_claim_lease_idx').on(
+      table.deliveryStatus,
+      table.claimExpiresAt
+    ),
     organizationEventIdx: index('business_event_outbox_org_event_idx').on(
       table.organizationId,
       table.eventType