import type { DrizzleDataStore } from '@opensip-cli/datastore/internal';
/** Hard ceiling for one bounded Session-retention transaction. */
export declare const MAX_SESSION_MAINTENANCE_BATCH_SIZE = 500;
/** Transactional bounded pruning operations for persisted Tool Sessions. */
export declare class SessionMaintenanceRepo {
    private readonly datastore;
    constructor(datastore: DrizzleDataStore);
    /**
     * Keep the newest `keep` sessions by start time and delete the rest.
     * `keep <= 0` disables count pruning. Foreign-key cascades remove sibling
     * host-metrics and payload rows.
     */
    pruneToCount(keep: number): number;
    /**
     * Delete at most `batchSize` of the oldest sessions exceeding `keep`.
     *
     * Selection and deletion share one datastore write lock and SQLite
     * transaction. Equal timestamps are ordered by opaque Session ID so repeated
     * calls make deterministic progress without an unbounded ID query.
     */
    pruneToCountBatch(keep: number, batchSize?: number): number;
    /** Delete sessions older than the given Date. Returns affected rowcount. */
    purge(before: Date): number;
    /**
     * Delete at most `batchSize` sessions older than `before`, oldest first.
     *
     * Selection and deletion share one datastore write lock and SQLite
     * transaction. Equal timestamps are ordered by opaque Session ID so repeated
     * calls make deterministic progress without an unbounded ID query.
     */
    purgeBatch(before: Date, batchSize?: number): number;
    /** Delete every session. Returns affected rowcount. */
    clearAll(): number;
    /**
     * Delete ONE tool's sessions (`tools data purge`, ADR-0042). Associated
     * `session_tool_payload` rows go via the schema's `onDelete: 'cascade'` FK
     * (the sqlite backend runs `PRAGMA foreign_keys = ON`). Returns the deleted
     * session count.
     */
    clearForTool(toolId: string): number;
}
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