feat(session): add durable session archival

packages/core/src/session/info.ts

@@ -53,7 +53,7 @@ export function fromRow(row: typeof SessionTable.$inferSelect): SessionSchema.In
     time: {
       created: DateTime.makeUnsafe(row.time_created),
       updated: DateTime.makeUnsafe(row.time_updated),
-      archived: row.time_archived ? DateTime.makeUnsafe(row.time_archived) : undefined,
+      archived: row.time_archived !== null ? DateTime.makeUnsafe(row.time_archived) : undefined,
     },
   })
 }

packages/core/src/session/message-updater.ts

@@ -171,6 +171,7 @@ export function update(adapter: Adapter, event: SessionEvent.Event) {
       },
       "session.moved": () => Effect.void,
       "session.renamed": () => Effect.void,
+      "session.archived": () => Effect.void,
       "session.deleted": () => Effect.void,
       "session.forked": () => Effect.void,
       "session.input.promoted": () => Effect.void,

packages/core/src/session/projector.ts

@@ -609,6 +609,17 @@ const layer = Layer.effectDiscard(
         .run()
         .pipe(Effect.orDie),
     )
+    yield* events.project(SessionEvent.Archived, (event) =>
+      db
+        .update(SessionTable)
+        .set({
+          time_archived: DateTime.toEpochMillis(event.created),
+          time_updated: DateTime.toEpochMillis(event.created),
+        })
+        .where(eq(SessionTable.id, event.data.sessionID))
+        .run()
+        .pipe(Effect.orDie),
+    )
     yield* events.project(SessionEvent.UsageRecorded, (event) => applyUsage(db, event.data.sessionID, event.data))
     yield* events.project(SessionEvent.Forked, (event) => projectFork(db, event))
     yield* events.project(SessionEvent.InputPromoted, (event) =>