/**
 * Return the timestamp of the last write to the current version. O(1) — reads
 * the denormalized `fs_versions.last_write_at` column maintained by every
 * write primitive.
 *
 * Semantics: "write" means any direct mutation of `fs_entries` under this
 * version_id (including tombstones, mode changes, mtime touches, and bulk
 * merge/cherry-pick/revert applies). A freshly forked version inherits its
 * parent's content by COW but reports its own creation time until the first
 * write — sibling branches do not affect it.
 *
 * Returns `null` only when the current version has somehow lost its row,
 * which shouldn't happen in normal use. Callers polling for changes should
 * compare against the last observed value rather than treating `null` as
 * "no change."
 */
export declare const getLastModified: <TFs>(ctx: import("./context.js").FilesystemOpsContext<TFs>) => Promise<Date | null>;
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