/**
 * Tool: suggest_schema_optimizations
 * Returns analysis data about table schema for LLM to suggest optimizations
 */
export interface SuggestSchemaOptimizationsInput {
    schema: string;
    table: string;
}
export interface ColumnAnalysis {
    column_name: string;
    data_type: string;
    character_maximum_length: number | null;
    nullability_rate: number;
    cardinality: number;
    avg_width: number;
    is_indexed: boolean;
    is_foreign_key: boolean;
    distinct_sample_size: number;
}
export interface ForeignKeyAnalysis {
    constraint_name: string;
    column_name: string;
    foreign_table: string;
    foreign_column: string;
    has_index: boolean;
}
export interface BloatAnalysis {
    n_live_tup: number;
    n_dead_tup: number;
    bloat_percentage: number;
    last_vacuum: string | null;
    last_autovacuum: string | null;
    last_analyze: string | null;
}
export interface DataTypeIssue {
    column_name: string;
    current_type: string;
    issue: string;
    suggestion: string;
}
export interface SchemaOptimizationsOutput {
    schema: string;
    table: string;
    column_analysis: ColumnAnalysis[];
    foreign_keys: ForeignKeyAnalysis[];
    bloat_analysis: BloatAnalysis;
    data_type_issues: DataTypeIssue[];
    total_size: string;
    row_count: number;
}
/**
 * Analyzes table schema and returns data for optimization suggestions
 */
export declare function suggestSchemaOptimizations(input: SuggestSchemaOptimizationsInput): Promise<SchemaOptimizationsOutput>;
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