feat(core): add embedded v2 session runtime and tool foundation (#30632)

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

@@ -27,5 +27,9 @@ export const migrations = (
     import("./migration/20260601202201_amazing_prowler"),
     import("./migration/20260602002951_lowly_union_jack"),
     import("./migration/20260602182828_add_project_directories"),
+    import("./migration/20260603001617_session_message_projection_indexes"),
+    import("./migration/20260603040000_session_message_projection_order"),
+    import("./migration/20260603141458_session_input_inbox"),
+    import("./migration/20260603160727_jittery_ezekiel_stane"),
   ])
 ).map((module) => module.default) satisfies DatabaseMigration.Migration[]

packages/core/src/database/migration.ts

@@ -1,12 +1,13 @@
 export * as DatabaseMigration from "./migration"
 
 import { sql } from "drizzle-orm"
-import { Effect } from "effect"
+import { Effect, Semaphore } from "effect"
 import type { EffectDrizzleSqlite } from "@opencode-ai/effect-drizzle-sqlite"
 import { migrations } from "./migration.gen"
 
 type Database = EffectDrizzleSqlite.EffectSQLiteDatabase
 type Transaction = Parameters<Parameters<Database["transaction"]>[0]>[0]
+const lock = Semaphore.makeUnsafe(1)
 
 export type Migration = {
   id: string
@@ -14,7 +15,7 @@ export type Migration = {
 }
 
 export function apply(db: Database) {
-  return applyOnly(db, migrations)
+  return lock.withPermit(applyOnly(db, migrations))
 }
 
 export function applyOnly(db: Database, input: Migration[]) {

packages/core/src/database/migration/20260603001617_session_message_projection_indexes.ts

@@ -0,0 +1,15 @@
+import { Effect } from "effect"
+import type { DatabaseMigration } from "../migration"
+
+export default {
+  id: "20260603001617_session_message_projection_indexes",
+  up(tx) {
+    return Effect.gen(function* () {
+      yield* tx.run(`DROP INDEX IF EXISTS \`session_message_session_idx\`;`)
+      yield* tx.run(`DROP INDEX IF EXISTS \`session_message_session_type_idx\`;`)
+      yield* tx.run(`CREATE INDEX \`event_aggregate_seq_idx\` ON \`event\` (\`aggregate_id\`,\`seq\`);`)
+      yield* tx.run(`CREATE INDEX \`session_message_session_time_created_id_idx\` ON \`session_message\` (\`session_id\`,\`time_created\`,\`id\`);`)
+      yield* tx.run(`CREATE INDEX \`session_message_session_type_time_created_id_idx\` ON \`session_message\` (\`session_id\`,\`type\`,\`time_created\`,\`id\`);`)
+    })
+  },
+} satisfies DatabaseMigration.Migration

packages/core/src/database/migration/20260603040000_session_message_projection_order.ts

@@ -0,0 +1,18 @@
+import { Effect } from "effect"
+import type { DatabaseMigration } from "../migration"
+
+export default {
+  id: "20260603040000_session_message_projection_order",
+  up(tx) {
+    return Effect.gen(function* () {
+      yield* tx.run(`ALTER TABLE \`session_message\` ADD COLUMN \`seq\` integer NOT NULL DEFAULT 0;`)
+      yield* tx.run(`UPDATE \`session_message\` SET \`seq\` = COALESCE((SELECT \`seq\` + 1 FROM \`event\` WHERE \`event\`.\`id\` = \`session_message\`.\`id\`), 0);`)
+      const unmatched = yield* tx.get<{ count: number }>(`SELECT COUNT(*) AS \`count\` FROM \`session_message\` WHERE \`seq\` = 0;`)
+      if ((unmatched?.count ?? 0) > 0) return yield* Effect.die("Cannot migrate session_message projections without matching durable events")
+      yield* tx.run(`UPDATE \`session_message\` SET \`seq\` = \`seq\` - 1;`)
+      yield* tx.run(`DROP INDEX IF EXISTS \`session_message_session_type_time_created_id_idx\`;`)
+      yield* tx.run(`CREATE INDEX \`session_message_session_seq_idx\` ON \`session_message\` (\`session_id\`,\`seq\`);`)
+      yield* tx.run(`CREATE INDEX \`session_message_session_type_seq_idx\` ON \`session_message\` (\`session_id\`,\`type\`,\`seq\`);`)
+    })
+  },
+} satisfies DatabaseMigration.Migration

packages/core/src/database/migration/20260603141458_session_input_inbox.ts

@@ -0,0 +1,25 @@
+import { Effect } from "effect"
+import type { DatabaseMigration } from "../migration"
+
+export default {
+  id: "20260603141458_session_input_inbox",
+  up(tx) {
+    return Effect.gen(function* () {
+      yield* tx.run(`
+        CREATE TABLE \`session_input\` (
+          \`seq\` integer PRIMARY KEY AUTOINCREMENT,
+          \`id\` text NOT NULL UNIQUE,
+          \`session_id\` text NOT NULL,
+          \`prompt\` text NOT NULL,
+          \`delivery\` text NOT NULL,
+          \`promoted_seq\` integer,
+          \`time_created\` integer NOT NULL,
+          CONSTRAINT \`fk_session_input_session_id_session_id_fk\` FOREIGN KEY (\`session_id\`) REFERENCES \`session\`(\`id\`) ON DELETE CASCADE
+        );
+      `)
+      yield* tx.run(
+        `CREATE INDEX \`session_input_session_pending_seq_idx\` ON \`session_input\` (\`session_id\`,\`promoted_seq\`,\`seq\`);`,
+      )
+    })
+  },
+} satisfies DatabaseMigration.Migration

packages/core/src/database/migration/20260603160727_jittery_ezekiel_stane.ts

@@ -0,0 +1,18 @@
+import { Effect } from "effect"
+import type { DatabaseMigration } from "../migration"
+
+export default {
+  id: "20260603160727_jittery_ezekiel_stane",
+  up(tx) {
+    return Effect.gen(function* () {
+      yield* tx.run(`DROP INDEX IF EXISTS \`session_input_session_pending_seq_idx\`;`)
+      yield* tx.run(`CREATE INDEX IF NOT EXISTS \`event_aggregate_type_seq_idx\` ON \`event\` (\`aggregate_id\`,\`type\`,\`seq\`);`)
+      yield* tx.run(
+        `CREATE INDEX IF NOT EXISTS \`session_input_session_pending_delivery_seq_idx\` ON \`session_input\` (\`session_id\`,\`promoted_seq\`,\`delivery\`,\`seq\`);`,
+      )
+      yield* tx.run(
+        `CREATE INDEX IF NOT EXISTS \`session_message_session_time_created_id_idx\` ON \`session_message\` (\`session_id\`,\`time_created\`,\`id\`);`,
+      )
+    })
+  },
+} satisfies DatabaseMigration.Migration

packages/core/src/database/sqlite.bun.ts

@@ -175,8 +175,9 @@ const drizzleLayer = Layer.effect(
   }),
 )
 
-export const layer = (config: Config) =>
-  Layer.merge(
-    nativeLayer(config),
-    Layer.merge(sqliteLayer(config), drizzleLayer).pipe(Layer.provide(nativeLayer(config))),
-  ).pipe(Layer.provide(Reactivity.layer))
+export const layer = (config: Config) => {
+  const native = nativeLayer(config)
+  return Layer.merge(native, Layer.merge(sqliteLayer(config), drizzleLayer).pipe(Layer.provide(native))).pipe(
+    Layer.provide(Reactivity.layer),
+  )
+}

packages/core/src/database/sqlite.node.ts

@@ -170,8 +170,9 @@ const drizzleLayer = Layer.effect(
   }),
 )
 
-export const layer = (config: Config) =>
-  Layer.merge(
-    nativeLayer(config),
-    Layer.merge(sqliteLayer(config), drizzleLayer).pipe(Layer.provide(nativeLayer(config))),
-  ).pipe(Layer.provide(Reactivity.layer))
+export const layer = (config: Config) => {
+  const native = nativeLayer(config)
+  return Layer.merge(native, Layer.merge(sqliteLayer(config), drizzleLayer).pipe(Layer.provide(native))).pipe(
+    Layer.provide(Reactivity.layer),
+  )
+}