refactor(core): move database schema ownership (#29068)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

packages/core/src/event/sql.ts

@@ -0,0 +1,18 @@
+import { sqliteTable, text, integer } from "drizzle-orm/sqlite-core"
+import type { EventV2 } from "../event"
+
+export const EventSequenceTable = sqliteTable("event_sequence", {
+  aggregate_id: text().notNull().primaryKey(),
+  seq: integer().notNull(),
+  owner_id: text(),
+})
+
+export const EventTable = sqliteTable("event", {
+  id: text().$type<EventV2.ID>().primaryKey(),
+  aggregate_id: text()
+    .notNull()
+    .references(() => EventSequenceTable.aggregate_id, { onDelete: "cascade" }),
+  seq: integer().notNull(),
+  type: text().notNull(),
+  data: text({ mode: "json" }).$type<Record<string, unknown>>().notNull(),
+})