/**
 * SQLite store for the project-scope BRAIN domain via drizzle-orm/node-sqlite +
 * node:sqlite (DatabaseSync).
 *
 * ## E6-L2 — thin-facade migration (T11522)
 *
 * `getBrainDb()` is now a thin facade that delegates the database open to
 * {@link openDualScopeDb}('project', cwd) — the canonical dual-scope chokepoint
 * introduced by E3/E4 (T11512/T11517) and already adopted by the tasks domain
 * (E6-L1, T11521). This ensures:
 *
 * - Every brain-domain open flows through the single pragma SSoT (ADR-068/069).
 * - The brain tables now live inside the consolidated project `cleo.db` — NOT a
 *   separate `brain.db` file — co-existing with `tasks_*` / `conduit_*` / etc.
 * - DB Open Guard Gate 3 (`scripts/lint-no-direct-db-open.mjs`) stays green: the
 *   only native open is inside `dual-scope-db.ts`.
 *
 * The legacy `drizzle-brain` migrations are still applied to this handle during
 * the E3→E6 transition (every brain migration is `CREATE TABLE IF NOT EXISTS` /
 * additive `ALTER TABLE`, so re-applying onto the consolidated `cleo.db` is
 * idempotent). This creates the legacy runtime-queried physical tables — most
 * notably `deriver_queue` (unprefixed; the consolidated schema carries the
 * prefixed `brain_deriver_queue`) — alongside the consolidated `brain_*` tables.
 * The exodus migration (T11248) renames them; E6-L7/L8 remove the legacy ones.
 *
 * ## Post-hoc DDL removal (T11522 acceptance criteria)
 *
 * Every `ensureColumns` band-aid (~15) and raw `CREATE TABLE IF NOT EXISTS`
 * (~8) that previously lived in {@link runBrainMigrations} has been removed. All
 * of them were redundant safety-nets fully covered by the `drizzle-brain`
 * migration files (the journal reconciler `probeAndMarkApplied` is robust enough
 * to detect already-applied DDL — see migration-manager.ts, T632). The ONE table
 * with no migration anywhere — `brain_task_observations` (T1615, a runtime-only
 * join cache mapped to `null` by exodus) — was converted to a forward Drizzle
 * migration under `migrations/drizzle-cleo-project/20260601000002_t11522-brain-task-observations`,
 * matching the T9179 precedent (ensureColumns → forward migration).
 *
 * @epic T5149
 * @task T5128
 * @task T11522 - E6-L2: route getBrainDb through openDualScopeDb (SG-DB-SUBSTRATE-V2)
 */
import type { DatabaseSync } from 'node:sqlite';
import type { NodeSQLiteDatabase } from 'drizzle-orm/node-sqlite';
import * as brainSchema from './schema/memory-schema.js';
/** Schema version for newly created brain databases. Single source of truth. */
export declare const BRAIN_SCHEMA_VERSION = "1.0.0";
/**
 * Get the path to the brain-domain SQLite database file.
 *
 * ## E6-L2 (T11522)
 *
 * After the dual-scope migration, `getBrainDb()` opens the consolidated project
 * `cleo.db` via {@link openDualScopeDb} — not the legacy standalone `brain.db`.
 * This function therefore returns the dual-scope `cleo.db` path so that callers
 * checking for the file `getBrainDb()` created (existence / backup / health
 * probes) point at the correct file.
 */
export declare function getBrainDbPath(cwd?: string): string;
/**
 * Resolve the absolute path to the drizzle-brain migrations folder inside
 * @cleocode/core, using ESM-native module resolution (T1177).
 *
 * Delegates to {@link resolveCorePackageMigrationsFolder} which handles
 * bundled dist/, workspace dev, and global-install layouts uniformly via
 * `import.meta.resolve()` + `createRequire().resolve()` fallback.
 */
export declare function resolveBrainMigrationsFolder(): string;
/**
 * Check whether the sqlite-vec extension is loaded for the current brain.db.
 */
export declare function isBrainVecLoaded(): boolean;
/**
 * Initialize the project-scope BRAIN domain SQLite database (lazy, singleton).
 *
 * ## E6-L2 façade (T11522)
 *
 * Delegates the physical DB open to {@link openDualScopeDb}('project', cwd) —
 * the canonical dual-scope chokepoint. The returned `NodeSQLiteDatabase` wraps
 * the same `DatabaseSync` handle as the consolidated project `cleo.db` but is
 * typed against the legacy brain schema (`brainSchema`, physical tables
 * `brain_decisions`, …) so all existing brain callers compile and run without
 * change. The legacy `drizzle-brain` migrations are still applied to this handle
 * during the E3→E6 transition (additive / `IF NOT EXISTS` — idempotent on the
 * consolidated DB) so the runtime-queried legacy physical tables (notably
 * `deriver_queue`) co-exist with the consolidated `brain_*` tables.
 *
 * Brain-specific malformation auto-recovery (T10303 / Saga T10281) previously
 * ran here against the standalone `brain.db` file. That file no longer backs the
 * brain domain after this leaf — the brain tables live inside `cleo.db`, whose
 * malformation recovery is a dual-scope-level concern (the brain-only
 * quarantine/snapshot-restore pipeline would corrupt the co-resident `tasks_*` /
 * `conduit_*` domains). The recovery primitive itself (`recoverMalformedBrainDb`)
 * is retained for `doctor` use; only its wiring into this chokepoint is removed.
 *
 * Uses a promise guard so concurrent callers wait for the same initialization to
 * complete (migrations are async).
 */
export declare function getBrainDb(cwd?: string): Promise<NodeSQLiteDatabase<typeof brainSchema>>;
/**
 * Close the brain-domain database connection and release resources.
 *
 * ## E6-L2 (T11522)
 *
 * The brain domain now SHARES the consolidated project `cleo.db` handle with the
 * tasks domain (both open it via {@link openDualScopeDb}, same cache key). This
 * function therefore must NOT close the underlying `DatabaseSync` nor evict the
 * dual-scope cache — doing so would break in-flight tasks-domain queries with
 * "database is not open". It only drops the brain-domain singleton references;
 * the shared handle's lifecycle is owned by `openDualScopeDb` and torn down by a
 * coordinated reset (`closeAllDatabases` → `closeDb` → `_resetDualScopeDbCache`).
 */
export declare function closeBrainDb(): void;
/**
 * Reset brain-domain singleton state without saving.
 * Used during tests or when the database file is recreated.
 * Safe to call multiple times.
 *
 * ## E6-L2 (T11522)
 *
 * Drops only the brain-domain singleton references — does NOT close the shared
 * dual-scope `cleo.db` handle nor evict the dual-scope cache (that handle is
 * shared with the tasks domain). Mirrors {@link closeBrainDb}.
 */
export declare function resetBrainDbState(): void;
/**
 * Get the underlying node:sqlite DatabaseSync instance for brain.db.
 * Useful for direct PRAGMA calls or raw SQL operations.
 * Returns null if the database hasn't been initialized.
 */
export declare function getBrainNativeDb(): DatabaseSync | null;
export type { NodeSQLiteDatabase };
/**
 * Re-export brain schema for external use.
 */
export { brainSchema };
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