{
  "version": 3,
  "sources": ["../../src/lib/SQLiteSyncStorage.ts"],
  "sourcesContent": ["import { transaction } from '@tldraw/state'\nimport { SerializedSchema, StoreSnapshot, UnknownRecord } from '@tldraw/store'\nimport { assert, objectMapEntries, throttle } from '@tldraw/utils'\nimport {\n\tcomputeTombstonePruning,\n\tDEFAULT_INITIAL_SNAPSHOT,\n\tMAX_TOMBSTONES,\n} from './InMemorySyncStorage'\nimport { MicrotaskNotifier } from './MicrotaskNotifier'\nimport { RoomSnapshot } from './TLSyncRoom'\nimport {\n\tconvertStoreSnapshotToRoomSnapshot,\n\tTLSyncForwardDiff,\n\tTLSyncStorage,\n\tTLSyncStorageGetChangesSinceResult,\n\tTLSyncStorageOnChangeCallbackProps,\n\tTLSyncStorageTransaction,\n\tTLSyncStorageTransactionCallback,\n\tTLSyncStorageTransactionOptions,\n\tTLSyncStorageTransactionResult,\n} from './TLSyncStorage'\n\n/**\n * Valid input value types for SQLite query parameters.\n * These are the types that can be passed as bindings to prepared statements.\n * @public\n */\nexport type TLSqliteInputValue = null | number | bigint | string | Uint8Array\n\n/**\n * Possible output value types returned from SQLite queries.\n * Includes all input types plus Uint8Array for BLOB columns.\n * @public\n */\nexport type TLSqliteOutputValue = null | number | bigint | string | Uint8Array\n\n/**\n * A row returned from a SQLite query, mapping column names to their values.\n * @public\n */\nexport type TLSqliteRow = Record<string, TLSqliteOutputValue>\n\n/**\n * A prepared statement that can be executed multiple times with different bindings.\n * @public\n */\nexport interface TLSyncSqliteStatement<\n\tTResult extends TLSqliteRow | void,\n\tTParams extends TLSqliteInputValue[] = [],\n> {\n\t/** Execute the statement and iterate over results one at a time */\n\titerate(...bindings: TParams): IterableIterator<TResult>\n\t/** Execute the statement and return all results as an array */\n\tall(...bindings: TParams): TResult[]\n\t/** Execute the statement without returning results (for DML) */\n\trun(...bindings: TParams): void\n}\n\n/**\n * Configuration for SQLiteSyncStorage.\n * @public\n */\nexport interface TLSyncSqliteWrapperConfig {\n\t/** Prefix for all table names (default: ''). E.g. 'sync_' creates tables 'sync_documents', 'sync_tombstones', 'sync_metadata' */\n\ttablePrefix?: string\n}\n\n/**\n * Interface for SQLite storage with prepare, exec and transaction capabilities.\n * @public\n */\nexport interface TLSyncSqliteWrapper {\n\t/** Optional configuration for table names. If not provided, defaults are used. */\n\treadonly config?: TLSyncSqliteWrapperConfig\n\t/** Prepare a SQL statement for execution */\n\tprepare<TResult extends TLSqliteRow | void, TParams extends TLSqliteInputValue[] = []>(\n\t\tsql: string\n\t): TLSyncSqliteStatement<TResult, TParams>\n\t/** Execute raw SQL (for DDL, multi-statement scripts) */\n\texec(sql: string): void\n\t/** Execute a callback within a transaction */\n\ttransaction<T>(callback: () => T): T\n}\n\nexport function migrateSqliteSyncStorage(\n\tstorage: TLSyncSqliteWrapper,\n\t{\n\t\tdocumentsTable = 'documents',\n\t\tobjectsTable = 'objects',\n\t\ttombstonesTable = 'tombstones',\n\t\tmetadataTable = 'metadata',\n\t}: {\n\t\tdocumentsTable?: string\n\t\tobjectsTable?: string\n\t\ttombstonesTable?: string\n\t\tmetadataTable?: string\n\t} = {}\n): void {\n\tlet migrationVersion = 0\n\ttry {\n\t\tconst row = storage\n\t\t\t.prepare<{\n\t\t\t\tmigrationVersion: number\n\t\t\t}>(`SELECT migrationVersion FROM ${metadataTable} LIMIT 1`)\n\t\t\t.all()[0]\n\t\tmigrationVersion = row?.migrationVersion ?? 0\n\t} catch (_e) {\n\t\t// noop\n\t}\n\n\tif (migrationVersion === 0) {\n\t\tmigrationVersion++\n\t\tstorage.exec(`\n\t\t\tCREATE TABLE ${documentsTable} (\n\t\t\t\tid TEXT PRIMARY KEY,\n\t\t\t\tstate BLOB NOT NULL,\n\t\t\t\tlastChangedClock INTEGER NOT NULL\n\t\t\t);\n\n\t\t\tCREATE INDEX idx_${documentsTable}_lastChangedClock ON ${documentsTable}(lastChangedClock);\n\n\t\t\tCREATE TABLE ${tombstonesTable} (\n\t\t\t\tid TEXT PRIMARY KEY,\n\t\t\t\tclock INTEGER NOT NULL\n\t\t\t);\n\t\t\tCREATE INDEX idx_${tombstonesTable}_clock ON ${tombstonesTable}(clock);\n\n\t\t\t-- This table is used to store the metadata for the sync storage.\n\t\t\t-- There should only be one row in this table.\n\t\t\tCREATE TABLE ${metadataTable} (\n\t\t\t  migrationVersion INTEGER NOT NULL,\n\t\t\t\tdocumentClock INTEGER NOT NULL,\n\t\t\t\ttombstoneHistoryStartsAtClock INTEGER NOT NULL,\n\t\t\t\tschema TEXT NOT NULL\n\t\t\t);\n\t\t\t\n\t\t\tINSERT INTO ${metadataTable} (migrationVersion, documentClock, tombstoneHistoryStartsAtClock, schema) VALUES (2, 0, 0, '')\n\t\t`)\n\t\t// Skip migration 2 since we created the table with BLOB already\n\t\tmigrationVersion++\n\t}\n\n\tif (migrationVersion === 1) {\n\t\t// Migration 2: Convert state column from TEXT to BLOB\n\t\t// SQLite doesn't support ALTER COLUMN, so we need to recreate the table\n\t\tmigrationVersion++\n\t\tstorage.exec(`\n\t\t\tCREATE TABLE ${documentsTable}_new (\n\t\t\t\tid TEXT PRIMARY KEY,\n\t\t\t\tstate BLOB NOT NULL,\n\t\t\t\tlastChangedClock INTEGER NOT NULL\n\t\t\t);\n\n\t\t\tINSERT INTO ${documentsTable}_new (id, state, lastChangedClock)\n\t\t\tSELECT id, CAST(state AS BLOB), lastChangedClock FROM ${documentsTable};\n\n\t\t\tDROP TABLE ${documentsTable};\n\n\t\t\tALTER TABLE ${documentsTable}_new RENAME TO ${documentsTable};\n\n\t\t\tCREATE INDEX idx_${documentsTable}_lastChangedClock ON ${documentsTable}(lastChangedClock);\n\t\t`)\n\t}\n\n\tif (migrationVersion === 2) {\n\t\t// Migration 3: Add the object-store lane table. Object-lane records (e.g. comments) are\n\t\t// partitioned out of the documents table so the document snapshot never contains them.\n\t\t// They share the documents' clock and tombstones.\n\t\tmigrationVersion++\n\t\tstorage.exec(`\n\t\t\tCREATE TABLE ${objectsTable} (\n\t\t\t\tid TEXT PRIMARY KEY,\n\t\t\t\tstate BLOB NOT NULL,\n\t\t\t\tlastChangedClock INTEGER NOT NULL\n\t\t\t);\n\n\t\t\tCREATE INDEX idx_${objectsTable}_lastChangedClock ON ${objectsTable}(lastChangedClock);\n\t\t`)\n\t}\n\n\t// add more migrations here if and when needed\n\n\tstorage.exec(`UPDATE ${metadataTable} SET migrationVersion = ${migrationVersion}`)\n}\n\nconst textEncoder = new TextEncoder()\nconst textDecoder = new TextDecoder()\n\nfunction encodeState(state: unknown): Uint8Array {\n\treturn textEncoder.encode(JSON.stringify(state))\n}\n\nfunction decodeState<T>(state: Uint8Array): T {\n\treturn JSON.parse(textDecoder.decode(state))\n}\n\n/**\n * SQLite-based implementation of TLSyncStorage.\n * Stores documents, tombstones, metadata, and clock values in SQLite tables.\n *\n * This storage backend provides persistent synchronization state that survives\n * process restarts, unlike InMemorySyncStorage which loses data when the process ends.\n *\n * @example\n * ```ts\n * // With Cloudflare Durable Objects\n * import { SQLiteSyncStorage, DurableObjectSqliteSyncWrapper } from '@tldraw/sync-core'\n *\n * const sql = new DurableObjectSqliteSyncWrapper(this.ctx.storage)\n * const storage = new SQLiteSyncStorage({ sql })\n * ```\n *\n * @example\n * ```ts\n * // With Node.js sqlite (Node 22.5+)\n * import { DatabaseSync } from 'node:sqlite'\n * import { SQLiteSyncStorage, NodeSqliteWrapper } from '@tldraw/sync-core'\n *\n * const db = new DatabaseSync('sync-state.db')\n * const sql = new NodeSqliteWrapper(db)\n * const storage = new SQLiteSyncStorage({ sql })\n * ```\n *\n * @example\n * ```ts\n * // Initialize with an existing snapshot\n * const storage = new SQLiteSyncStorage({ sql, snapshot: existingSnapshot })\n * ```\n *\n * @public\n */\nexport class SQLiteSyncStorage<R extends UnknownRecord> implements TLSyncStorage<R> {\n\t/**\n\t * Check if the storage has been initialized (has data in the clock table).\n\t * Useful for determining whether to load from an external source on first access.\n\t */\n\tstatic hasBeenInitialized(storage: TLSyncSqliteWrapper): boolean {\n\t\tconst prefix = storage.config?.tablePrefix ?? ''\n\t\ttry {\n\t\t\tconst schema = storage\n\t\t\t\t.prepare<{ schema: string }>(`SELECT schema FROM ${prefix}metadata LIMIT 1`)\n\t\t\t\t.all()[0]?.schema\n\t\t\treturn !!schema\n\t\t} catch (_e) {\n\t\t\treturn false\n\t\t}\n\t}\n\n\t/**\n\t * Get the current document clock value from storage without fully initializing.\n\t * Returns null if storage has not been initialized.\n\t * Useful for comparing storage freshness against external sources.\n\t */\n\tstatic getDocumentClock(storage: TLSyncSqliteWrapper): number | null {\n\t\tconst prefix = storage.config?.tablePrefix ?? ''\n\t\ttry {\n\t\t\tconst row = storage\n\t\t\t\t.prepare<{ documentClock: number }>(`SELECT documentClock FROM ${prefix}metadata LIMIT 1`)\n\t\t\t\t.all()[0]\n\t\t\t// documentClock exists but could be 0, so we check if the storage is initialized\n\t\t\tif (row && SQLiteSyncStorage.hasBeenInitialized(storage)) {\n\t\t\t\treturn row.documentClock\n\t\t\t}\n\t\t\treturn null\n\t\t} catch (_e) {\n\t\t\treturn null\n\t\t}\n\t}\n\n\t// Prepared statements - created once, reused many times\n\tprivate readonly stmts\n\n\tprivate readonly sql: TLSyncSqliteWrapper\n\n\t/** @internal */\n\treadonly objectTypes: ReadonlySet<string>\n\n\tconstructor({\n\t\tsql,\n\t\tsnapshot,\n\t\tobjectTypes,\n\t\tonChange,\n\t}: {\n\t\tsql: TLSyncSqliteWrapper\n\t\tsnapshot?: RoomSnapshot | StoreSnapshot<R>\n\t\t/**\n\t\t * Record type names stored in the object-store lane. Records of these types are routed to\n\t\t * a separate table: excluded from `getSnapshot()`, returned by `getObjectsSnapshot()`.\n\t\t * They share the documents' clock, tombstones, and transactions.\n\t\t */\n\t\tobjectTypes?: readonly string[]\n\t\tonChange?(arg: TLSyncStorageOnChangeCallbackProps): unknown\n\t}) {\n\t\tthis.sql = sql\n\t\tthis.objectTypes = new Set(objectTypes ?? [])\n\t\tconst prefix = sql.config?.tablePrefix ?? ''\n\t\tconst documentsTable = `${prefix}documents`\n\t\tconst objectsTable = `${prefix}objects`\n\t\tconst tombstonesTable = `${prefix}tombstones`\n\t\tconst metadataTable = `${prefix}metadata`\n\n\t\tmigrateSqliteSyncStorage(this.sql, {\n\t\t\tdocumentsTable,\n\t\t\tobjectsTable,\n\t\t\ttombstonesTable,\n\t\t\tmetadataTable,\n\t\t})\n\n\t\t// Both record tables have identical shape; prepare the same statements for each.\n\t\tconst makeRecordTableStmts = (table: string) => ({\n\t\t\tget: this.sql.prepare<{ state: Uint8Array }, [id: string]>(\n\t\t\t\t`SELECT state FROM ${table} WHERE id = ?`\n\t\t\t),\n\t\t\tgetWithClock: this.sql.prepare<{ state: Uint8Array; lastChangedClock: number }, [id: string]>(\n\t\t\t\t`SELECT state, lastChangedClock FROM ${table} WHERE id = ?`\n\t\t\t),\n\t\t\tinsert: this.sql.prepare<void, [id: string, state: Uint8Array, lastChangedClock: number]>(\n\t\t\t\t`INSERT OR REPLACE INTO ${table} (id, state, lastChangedClock) VALUES (?, ?, ?)`\n\t\t\t),\n\t\t\tdelete: this.sql.prepare<void, [id: string]>(`DELETE FROM ${table} WHERE id = ?`),\n\t\t\texists: this.sql.prepare<{ id: string }, [id: string]>(\n\t\t\t\t`SELECT id FROM ${table} WHERE id = ?`\n\t\t\t),\n\t\t\titerate: this.sql.prepare<{ state: Uint8Array; lastChangedClock: number }>(\n\t\t\t\t`SELECT state, lastChangedClock FROM ${table}`\n\t\t\t),\n\t\t\titerateEntries: this.sql.prepare<{ id: string; state: Uint8Array }>(\n\t\t\t\t`SELECT id, state FROM ${table}`\n\t\t\t),\n\t\t\titerateKeys: this.sql.prepare<{ id: string }>(`SELECT id FROM ${table}`),\n\t\t\titerateValues: this.sql.prepare<{ state: Uint8Array }>(`SELECT state FROM ${table}`),\n\t\t\tchangedSince: this.sql.prepare<{ state: Uint8Array }, [sinceClock: number]>(\n\t\t\t\t`SELECT state FROM ${table} WHERE lastChangedClock > ?`\n\t\t\t),\n\t\t})\n\n\t\t// Prepare all statements once\n\t\tthis.stmts = {\n\t\t\t// Metadata\n\t\t\tgetDocumentClock: this.sql.prepare<{ documentClock: number }>(\n\t\t\t\t`SELECT documentClock FROM ${metadataTable} LIMIT 1`\n\t\t\t),\n\t\t\tgetTombstoneHistoryStartsAtClock: this.sql.prepare<{ tombstoneHistoryStartsAtClock: number }>(\n\t\t\t\t`SELECT tombstoneHistoryStartsAtClock FROM ${metadataTable}`\n\t\t\t),\n\t\t\tgetSchema: this.sql.prepare<{ schema: string }>(`SELECT schema FROM ${metadataTable}`),\n\t\t\tsetSchema: this.sql.prepare<void, [schema: string]>(`UPDATE ${metadataTable} SET schema = ?`),\n\t\t\tsetTombstoneHistoryStartsAtClock: this.sql.prepare<void, [clock: number]>(\n\t\t\t\t`UPDATE ${metadataTable} SET tombstoneHistoryStartsAtClock = ?`\n\t\t\t),\n\t\t\tincrementDocumentClock: this.sql.prepare<void>(\n\t\t\t\t`UPDATE ${metadataTable} SET documentClock = documentClock + 1`\n\t\t\t),\n\n\t\t\t// Record tables (document lane + object-store lane)\n\t\t\tdocuments: makeRecordTableStmts(documentsTable),\n\t\t\tobjects: makeRecordTableStmts(objectsTable),\n\n\t\t\t// Tombstones\n\t\t\tinsertTombstone: this.sql.prepare<void, [id: string, clock: number]>(\n\t\t\t\t`INSERT OR REPLACE INTO ${tombstonesTable} (id, clock) VALUES (?, ?)`\n\t\t\t),\n\t\t\tdeleteTombstone: this.sql.prepare<void, [id: string]>(\n\t\t\t\t`DELETE FROM ${tombstonesTable} WHERE id = ?`\n\t\t\t),\n\t\t\tdeleteTombstonesBefore: this.sql.prepare<void, [clock: number]>(\n\t\t\t\t`DELETE FROM ${tombstonesTable} WHERE clock < ?`\n\t\t\t),\n\t\t\tcountTombstones: this.sql.prepare<{ count: number }>(\n\t\t\t\t`SELECT count(*) as count FROM ${tombstonesTable}`\n\t\t\t),\n\t\t\titerateTombstones: this.sql.prepare<{ id: string; clock: number }>(\n\t\t\t\t`SELECT id, clock FROM ${tombstonesTable} ORDER BY clock ASC`\n\t\t\t),\n\t\t\tgetTombstonesChangedSince: this.sql.prepare<{ id: string }, [sinceClock: number]>(\n\t\t\t\t`SELECT id FROM ${tombstonesTable} WHERE clock > ?`\n\t\t\t),\n\n\t\t\t// Initial setup (only used when loading a snapshot)\n\t\t\tupdateMetadata: this.sql.prepare<\n\t\t\t\tvoid,\n\t\t\t\t[documentClock: number, tombstoneHistoryStartsAtClock: number, schema: string]\n\t\t\t>(\n\t\t\t\t`UPDATE ${metadataTable} SET documentClock = ?, tombstoneHistoryStartsAtClock = ?, schema = ?`\n\t\t\t),\n\t\t}\n\n\t\t// Check if we already have data\n\t\tconst hasData = SQLiteSyncStorage.hasBeenInitialized(sql)\n\n\t\tif (snapshot || !hasData) {\n\t\t\tsnapshot = convertStoreSnapshotToRoomSnapshot(snapshot ?? DEFAULT_INITIAL_SNAPSHOT)\n\n\t\t\tconst documentClock = snapshot.documentClock ?? snapshot.clock ?? 0\n\t\t\tconst tombstoneHistoryStartsAtClock = snapshot.tombstoneHistoryStartsAtClock ?? documentClock\n\n\t\t\tthis.sql.exec(`\n\t\t\t\tDELETE FROM ${documentsTable};\n\t\t\t\tDELETE FROM ${objectsTable};\n\t\t\t\tDELETE FROM ${tombstonesTable};\n\t\t\t`)\n\n\t\t\t// Insert records, routing object-lane types into their partition (a seed snapshot may\n\t\t\t// carry object-lane records merged in, e.g. loaded from a separate persistence lane)\n\t\t\tfor (const doc of snapshot.documents) {\n\t\t\t\tconst table = this.objectTypes.has(doc.state.typeName)\n\t\t\t\t\t? this.stmts.objects\n\t\t\t\t\t: this.stmts.documents\n\t\t\t\ttable.insert.run(doc.state.id, encodeState(doc.state), doc.lastChangedClock)\n\t\t\t}\n\n\t\t\tif (snapshot.tombstones) {\n\t\t\t\tfor (const [id, clock] of objectMapEntries(snapshot.tombstones)) {\n\t\t\t\t\tthis.stmts.insertTombstone.run(id, clock)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.stmts.updateMetadata.run(\n\t\t\t\tdocumentClock,\n\t\t\t\ttombstoneHistoryStartsAtClock,\n\t\t\t\tJSON.stringify(snapshot.schema)\n\t\t\t)\n\t\t} else {\n\t\t\t// One-time sweep: rooms written before the objects table existed may have object-lane\n\t\t\t// records sitting in the documents table. Record ids are typeName-prefixed, so a PK\n\t\t\t// range scan per object type moves them cheaply (no-op once clean).\n\t\t\tfor (const typeName of this.objectTypes) {\n\t\t\t\tconst lo = `${typeName}:`\n\t\t\t\t// ';' is the next code point after ':' \u2014 [lo, hi) covers exactly the `type:` prefix\n\t\t\t\tconst hi = `${typeName};`\n\t\t\t\tthis.sql.exec(`\n\t\t\t\t\tINSERT OR REPLACE INTO ${objectsTable} (id, state, lastChangedClock)\n\t\t\t\t\tSELECT id, state, lastChangedClock FROM ${documentsTable}\n\t\t\t\t\tWHERE id >= '${lo}' AND id < '${hi}';\n\t\t\t\t\tDELETE FROM ${documentsTable} WHERE id >= '${lo}' AND id < '${hi}';\n\t\t\t\t`)\n\t\t\t}\n\t\t}\n\t\tif (onChange) {\n\t\t\tthis.onChange(onChange)\n\t\t}\n\t}\n\n\tprivate notifier = new MicrotaskNotifier<[TLSyncStorageOnChangeCallbackProps]>()\n\tonChange(callback: (arg: TLSyncStorageOnChangeCallbackProps) => void): () => void {\n\t\treturn this.notifier.register(callback)\n\t}\n\n\ttransaction<T>(\n\t\tcallback: TLSyncStorageTransactionCallback<R, T>,\n\t\topts?: TLSyncStorageTransactionOptions\n\t): TLSyncStorageTransactionResult<T, R> {\n\t\tconst clockBefore = this.getClock()\n\t\tconst trackChanges = opts?.emitChanges === 'always'\n\t\treturn this.sql.transaction(() => {\n\t\t\tconst txn = new SQLiteSyncStorageTransaction<R>(this, this.stmts)\n\t\t\tlet result: T\n\t\t\tlet changes: TLSyncForwardDiff<R> | undefined\n\t\t\ttry {\n\t\t\t\tresult = transaction(() => {\n\t\t\t\t\treturn callback(txn)\n\t\t\t\t}) as T\n\t\t\t\tif (trackChanges) {\n\t\t\t\t\tchanges = txn.getChangesSince(clockBefore)?.diff\n\t\t\t\t}\n\t\t\t} finally {\n\t\t\t\ttxn.close()\n\t\t\t}\n\t\t\tif (\n\t\t\t\ttypeof result === 'object' &&\n\t\t\t\tresult &&\n\t\t\t\t'then' in result &&\n\t\t\t\ttypeof result.then === 'function'\n\t\t\t) {\n\t\t\t\tthrow new Error('Transaction must return a value, not a promise')\n\t\t\t}\n\n\t\t\tconst clockAfter = this.getClock()\n\t\t\tconst didChange = clockAfter > clockBefore\n\t\t\tif (didChange) {\n\t\t\t\tthis.notifier.notify({ id: opts?.id, documentClock: clockAfter })\n\t\t\t}\n\t\t\treturn { documentClock: clockAfter, didChange: clockAfter > clockBefore, result, changes }\n\t\t})\n\t}\n\n\tgetClock(): number {\n\t\tconst clockRow = this.stmts.getDocumentClock.all()[0]\n\t\treturn clockRow?.documentClock ?? 0\n\t}\n\n\t/** @internal */\n\t_getTombstoneHistoryStartsAtClock(): number {\n\t\tconst clockRow = this.stmts.getTombstoneHistoryStartsAtClock.all()[0]\n\t\treturn clockRow?.tombstoneHistoryStartsAtClock ?? 0\n\t}\n\n\t/** @internal */\n\t_getSchema(): SerializedSchema {\n\t\tconst clockRow = this.stmts.getSchema.all()[0]\n\t\tassert(clockRow, 'Storage not initialized - clock row missing')\n\t\treturn JSON.parse(clockRow.schema)\n\t}\n\n\t/** @internal */\n\t_setSchema(schema: SerializedSchema): void {\n\t\tthis.stmts.setSchema.run(JSON.stringify(schema))\n\t}\n\n\t/** @internal */\n\tpruneTombstones = throttle(\n\t\t() => {\n\t\t\t// Runs from a timer, so a host that closed the database right after the last delete\n\t\t\t// (e.g. `room.close(); db.close()` in onSessionRemoved) would otherwise get an uncaught\n\t\t\t// throw from here; pruning is best-effort and simply runs again on the next delete.\n\t\t\ttry {\n\t\t\t\tconst tombstoneCount = this.stmts.countTombstones.all()[0].count as number\n\t\t\t\tif (tombstoneCount > MAX_TOMBSTONES) {\n\t\t\t\t\t// Get all tombstones sorted by clock ascending (oldest first)\n\t\t\t\t\tconst tombstones = this.stmts.iterateTombstones.all()\n\n\t\t\t\t\tconst result = computeTombstonePruning({ tombstones, documentClock: this.getClock() })\n\t\t\t\t\tif (result) {\n\t\t\t\t\t\tthis.sql.transaction(() => {\n\t\t\t\t\t\t\tthis.stmts.setTombstoneHistoryStartsAtClock.run(\n\t\t\t\t\t\t\t\tresult.newTombstoneHistoryStartsAtClock\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t// Delete all tombstones with clock < newTombstoneHistoryStartsAtClock in one operation.\n\t\t\t\t\t\t\t// This works because computeTombstonePruning ensures we never split a clock value.\n\t\t\t\t\t\t\tthis.stmts.deleteTombstonesBefore.run(result.newTombstoneHistoryStartsAtClock)\n\t\t\t\t\t\t})\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t} catch (e) {\n\t\t\t\tconsole.error('Failed to prune tombstones', e)\n\t\t\t}\n\t\t},\n\t\t1000,\n\t\t// prevent this from running synchronously to avoid blocking requests\n\t\t{ leading: false }\n\t)\n\n\tgetSnapshot(): RoomSnapshot {\n\t\t// object-lane records live in their own table, so the document snapshot is\n\t\t// pure-document by construction\n\t\treturn {\n\t\t\ttombstoneHistoryStartsAtClock: this._getTombstoneHistoryStartsAtClock(),\n\t\t\tdocumentClock: this.getClock(),\n\t\t\tdocuments: Array.from(this._iterateRecords(this.stmts.documents)),\n\t\t\ttombstones: Object.fromEntries(this._iterateTombstones()),\n\t\t\tschema: this._getSchema(),\n\t\t}\n\t}\n\n\tgetObjectsSnapshot(): RoomSnapshot['documents'] {\n\t\treturn Array.from(this._iterateRecords(this.stmts.objects))\n\t}\n\n\tgetObjectsByIds(ids: Iterable<string>): RoomSnapshot['documents'] {\n\t\tconst result: RoomSnapshot['documents'] = []\n\t\tconst seen = new Set<string>()\n\t\tfor (const id of ids) {\n\t\t\tif (seen.has(id)) continue\n\t\t\tseen.add(id)\n\t\t\tconst row = this.stmts.objects.getWithClock.all(id)[0]\n\t\t\tif (!row) continue\n\t\t\tresult.push({ state: decodeState<R>(row.state), lastChangedClock: row.lastChangedClock })\n\t\t}\n\t\treturn result\n\t}\n\n\tprivate *_iterateRecords(\n\t\ttable: SQLiteSyncStorage<R>['stmts']['documents']\n\t): IterableIterator<{ state: R; lastChangedClock: number }> {\n\t\tfor (const row of table.iterate.iterate()) {\n\t\t\tyield { state: decodeState<R>(row.state), lastChangedClock: row.lastChangedClock }\n\t\t}\n\t}\n\n\tprivate *_iterateTombstones(): IterableIterator<[string, number]> {\n\t\tfor (const row of this.stmts.iterateTombstones.iterate()) {\n\t\t\tyield [row.id, row.clock]\n\t\t}\n\t}\n}\n\n/**\n * Transaction implementation for SQLiteSyncStorage.\n * Provides access to documents, tombstones, and metadata within a transaction.\n *\n * @internal\n */\nclass SQLiteSyncStorageTransaction<R extends UnknownRecord> implements TLSyncStorageTransaction<R> {\n\tprivate _clock: number\n\tprivate _closed = false\n\tprivate _didIncrementClock: boolean = false\n\n\tconstructor(\n\t\tprivate storage: SQLiteSyncStorage<R>,\n\t\tprivate stmts: SQLiteSyncStorage<R>['stmts']\n\t) {\n\t\tthis._clock = this.storage.getClock()\n\t}\n\n\t/** @internal */\n\tclose() {\n\t\tthis._closed = true\n\t}\n\n\tprivate assertNotClosed() {\n\t\tassert(!this._closed, 'Transaction has ended, iterator cannot be consumed')\n\t}\n\n\tgetClock(): number {\n\t\treturn this._clock\n\t}\n\n\tprivate getNextClock(): number {\n\t\tif (!this._didIncrementClock) {\n\t\t\tthis._didIncrementClock = true\n\t\t\tthis.stmts.incrementDocumentClock.run()\n\t\t\tthis._clock = this.storage.getClock()\n\t\t}\n\t\treturn this._clock\n\t}\n\n\t/**\n\t * Which record table an id belongs to. Record ids are typeName-prefixed (`comment:abc`),\n\t * so the partition is derivable from the id alone.\n\t */\n\tprivate tableFor(id: string) {\n\t\tconst sep = id.indexOf(':')\n\t\tif (sep === -1) return this.stmts.documents\n\t\treturn this.storage.objectTypes.has(id.slice(0, sep))\n\t\t\t? this.stmts.objects\n\t\t\t: this.stmts.documents\n\t}\n\n\tget(id: string): R | undefined {\n\t\tthis.assertNotClosed()\n\t\tconst row = this.tableFor(id).get.all(id)[0]\n\t\tif (!row) return undefined\n\t\treturn decodeState<R>(row.state)\n\t}\n\n\tset(id: string, record: R): void {\n\t\tthis.assertNotClosed()\n\t\tassert(id === record.id, `Record id mismatch: key does not match record.id`)\n\t\tconst clock = this.getNextClock()\n\t\t// Automatically clear tombstone if it exists\n\t\tthis.stmts.deleteTombstone.run(id)\n\t\t// route by type: object-lane records live in their own table\n\t\tconst table = this.storage.objectTypes.has(record.typeName)\n\t\t\t? this.stmts.objects\n\t\t\t: this.stmts.documents\n\t\ttable.insert.run(id, encodeState(record), clock)\n\t}\n\n\tdelete(id: string): void {\n\t\tthis.assertNotClosed()\n\t\tconst table = this.tableFor(id)\n\t\t// Only create a tombstone if the record actually exists\n\t\tconst exists = table.exists.all(id)[0]\n\t\tif (!exists) return\n\t\tconst clock = this.getNextClock()\n\t\ttable.delete.run(id)\n\t\tthis.stmts.insertTombstone.run(id, clock)\n\t\tthis.storage.pruneTombstones()\n\t}\n\n\t// iteration spans both record tables so schema migrations cover object-lane records too\n\n\t*entries(): IterableIterator<[string, R]> {\n\t\tthis.assertNotClosed()\n\t\tfor (const table of [this.stmts.documents, this.stmts.objects]) {\n\t\t\tfor (const row of table.iterateEntries.iterate()) {\n\t\t\t\tthis.assertNotClosed()\n\t\t\t\tyield [row.id, decodeState<R>(row.state)]\n\t\t\t}\n\t\t}\n\t}\n\n\t*keys(): IterableIterator<string> {\n\t\tthis.assertNotClosed()\n\t\tfor (const table of [this.stmts.documents, this.stmts.objects]) {\n\t\t\tfor (const row of table.iterateKeys.iterate()) {\n\t\t\t\tthis.assertNotClosed()\n\t\t\t\tyield row.id\n\t\t\t}\n\t\t}\n\t}\n\n\t*values(): IterableIterator<R> {\n\t\tthis.assertNotClosed()\n\t\tfor (const table of [this.stmts.documents, this.stmts.objects]) {\n\t\t\tfor (const row of table.iterateValues.iterate()) {\n\t\t\t\tthis.assertNotClosed()\n\t\t\t\tyield decodeState<R>(row.state)\n\t\t\t}\n\t\t}\n\t}\n\n\tgetSchema(): SerializedSchema {\n\t\tthis.assertNotClosed()\n\t\treturn this.storage._getSchema()\n\t}\n\n\tsetSchema(schema: SerializedSchema): void {\n\t\tthis.assertNotClosed()\n\t\tthis.storage._setSchema(schema)\n\t}\n\n\tgetChangesSince(sinceClock: number): TLSyncStorageGetChangesSinceResult<R> | undefined {\n\t\tthis.assertNotClosed()\n\t\tconst clock = this.storage.getClock()\n\t\tif (sinceClock === clock) return undefined\n\t\tif (sinceClock > clock) {\n\t\t\t// something went wrong, wipe the slate clean\n\t\t\tsinceClock = -1\n\t\t}\n\t\tconst diff: TLSyncForwardDiff<R> = { puts: {}, deletes: [] }\n\t\tconst wipeAll = sinceClock < this.storage._getTombstoneHistoryStartsAtClock()\n\n\t\t// both record tables share the clock and tombstones, so the change feed spans both\n\t\tif (wipeAll) {\n\t\t\t// If wipeAll, include all records\n\t\t\tfor (const table of [this.stmts.documents, this.stmts.objects]) {\n\t\t\t\tfor (const row of table.iterateValues.iterate()) {\n\t\t\t\t\tconst state = decodeState<R>(row.state)\n\t\t\t\t\tdiff.puts[state.id] = state\n\t\t\t\t}\n\t\t\t}\n\t\t} else {\n\t\t\t// Get records changed since clock\n\t\t\tfor (const table of [this.stmts.documents, this.stmts.objects]) {\n\t\t\t\tfor (const row of table.changedSince.iterate(sinceClock)) {\n\t\t\t\t\tconst state = decodeState<R>(row.state)\n\t\t\t\t\tdiff.puts[state.id] = state\n\t\t\t\t}\n\t\t\t}\n\t\t\t// When wipeAll, deletes are redundant (full state is in puts). Only include tombstones otherwise.\n\t\t\tfor (const row of this.stmts.getTombstonesChangedSince.iterate(sinceClock)) {\n\t\t\t\tdiff.deletes.push(row.id)\n\t\t\t}\n\t\t}\n\n\t\treturn { diff, wipeAll }\n\t}\n}\n"],
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