refactor(core): drop legacy compaction event (#33404)

packages/core/src/database/migration.gen.ts

@@ -38,5 +38,6 @@ export const migrations = (
     import("./migration/20260611192811_lush_chimera"),
     import("./migration/20260612174303_project_dir_strategy"),
     import("./migration/20260622142730_simplify_session_context_epoch"),
+    import("./migration/20260622170816_reset_v2_session_state"),
   ])
 ).map((module) => module.default) satisfies DatabaseMigration.Migration[]

packages/core/src/database/migration/20260622170816_reset_v2_session_state.ts

@@ -0,0 +1,17 @@
+import { Effect } from "effect"
+import type { DatabaseMigration } from "../migration"
+
+export default {
+  id: "20260622170816_reset_v2_session_state",
+  up(tx) {
+    return Effect.gen(function* () {
+      yield* tx.run(`DELETE FROM \`session_context_epoch\`;`)
+      yield* tx.run(`DELETE FROM \`session_input\`;`)
+      yield* tx.run(`DELETE FROM \`session_message\`;`)
+      yield* tx.run(`DELETE FROM \`event\`;`)
+      yield* tx.run(`DELETE FROM \`event_sequence\`;`)
+      yield* tx.run(`UPDATE \`session\` SET \`workspace_id\` = NULL WHERE \`workspace_id\` IS NOT NULL;`)
+      yield* tx.run(`DELETE FROM \`workspace\`;`)
+    })
+  },
+} satisfies DatabaseMigration.Migration

packages/core/src/session/event.ts

@@ -436,20 +436,9 @@ export namespace Compaction {
   })
   export type Delta = typeof Delta.Type
 
-  // Retain the unpublished v1 decoder so stored beta events remain replayable.
-  export const EndedV1 = EventV2.define({
-    type: "session.next.compaction.ended",
-    ...options,
-    schema: {
-      ...Base,
-      text: Schema.String,
-      include: Schema.String.pipe(Schema.optional),
-    },
-  })
-
   export const Ended = EventV2.define({
     type: "session.next.compaction.ended",
-    durable: { aggregate: "sessionID", version: 2 },
+    ...options,
     schema: {
       ...Base,
       messageID: SessionMessageID.ID,

packages/core/src/session/projector.ts

@@ -417,9 +417,7 @@ export const layer = Layer.effectDiscard(
     yield* events.project(SessionEvent.Reasoning.Started, (event) => run(db, event))
     yield* events.project(SessionEvent.Reasoning.Ended, (event) => run(db, event))
     // yield* events.project(SessionEvent.Retried, (event) => run(db, event))
-    yield* events.project(SessionEvent.Compaction.Ended, (event) =>
-      event.durable?.version === 1 ? Effect.void : run(db, event),
-    )
+    yield* events.project(SessionEvent.Compaction.Ended, (event) => run(db, event))
   }),
 )