import type { PostgresAccessor } from '../../accessor/postgres.ts';
export interface ColumnInfo {
    name: string;
    type: string;
    nullable: boolean;
}
export interface ForeignKey {
    columns: string[];
    references: {
        schema: string;
        table: string;
        columns: string[];
    };
}
export interface IndexInfo {
    name: string;
    columns: string[];
    unique: boolean;
}
export interface Relationship {
    from: {
        schema: string;
        table: string;
        columns: string[];
    };
    to: {
        schema: string;
        table: string;
        columns: string[];
    };
    kind: 'many_to_one';
}
export interface EnumInfo {
    type: string;
    labels: string[];
}
export interface ColumnStats {
    n_distinct: number;
    most_common_vals: string[];
}
export declare function quoteIdent(ident: string): string;
export declare function listSchemas(accessor: PostgresAccessor, allowlist: readonly string[] | null): Promise<string[]>;
export declare function listTables(accessor: PostgresAccessor, schema: string): Promise<string[]>;
export declare function listViews(accessor: PostgresAccessor, schema: string): Promise<string[]>;
export declare function listMatviews(accessor: PostgresAccessor, schema: string): Promise<string[]>;
export declare function countRows(accessor: PostgresAccessor, schema: string, name: string): Promise<number>;
export declare function estimateSize(accessor: PostgresAccessor, schema: string, name: string): Promise<[number, number]>;
export declare function estimatedRowCount(accessor: PostgresAccessor, schema: string, name: string): Promise<number>;
export declare function tableSizeBytes(accessor: PostgresAccessor, schema: string, name: string): Promise<number>;
export declare function fetchRows(accessor: PostgresAccessor, schema: string, name: string, options: {
    limit: number;
    offset: number;
}): Promise<Record<string, unknown>[]>;
export declare function fetchColumns(accessor: PostgresAccessor, schema: string, name: string): Promise<ColumnInfo[]>;
export declare function fetchPrimaryKey(accessor: PostgresAccessor, schema: string, name: string): Promise<string[]>;
export declare function fetchForeignKeys(accessor: PostgresAccessor, schema: string, name: string): Promise<ForeignKey[]>;
export declare function fetchIndexes(accessor: PostgresAccessor, schema: string, name: string): Promise<IndexInfo[]>;
export declare function fetchAllRelationships(accessor: PostgresAccessor, schemas: readonly string[]): Promise<Relationship[]>;
export declare function fetchTableComment(accessor: PostgresAccessor, schema: string, name: string): Promise<string | null>;
export declare function fetchColumnComments(accessor: PostgresAccessor, schema: string, name: string): Promise<Map<string, string>>;
export declare function fetchEnumColumns(accessor: PostgresAccessor, schema: string, name: string): Promise<Map<string, EnumInfo>>;
export declare function fetchColumnStats(accessor: PostgresAccessor, schema: string, name: string): Promise<Map<string, ColumnStats>>;
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