/**
 * SchemaDiff (v3.x)
 *
 * Compares schema between two profiles using v2.18 GlobalSchemaView.
 * Reports added/removed/modified tables + column-level changes.
 */
import type { ProfileManager } from './profile-manager.js';
export interface SchemaColumn {
    name: string;
    type: string;
    nullable: boolean;
}
export interface SchemaDiffEntry {
    table: string;
    in: 'A' | 'B';
    columns: SchemaColumn[];
}
export interface SchemaDiffModified {
    table: string;
    columnsAdded: SchemaColumn[];
    columnsRemoved: SchemaColumn[];
    columnsChanged: {
        column: string;
        from: SchemaColumn | null;
        to: SchemaColumn | null;
    }[];
}
export interface SchemaDiffResult {
    /** Tables present in B but missing in A. */
    added: SchemaDiffEntry[];
    /** Tables present in A but missing in B. */
    removed: SchemaDiffEntry[];
    /** Tables present in both but with column differences. */
    modified: SchemaDiffModified[];
    /** True when added/removed/modified are all empty. */
    identical: boolean;
    /** Helpful summary for LLM. */
    summary: string;
}
export declare class SchemaDiff {
    /**
     * Compare schema of two profiles. Returns added (in B), removed (in A),
     * modified (column additions / removals / type changes), and identical
     * (a boolean).
     *
     * Profiles are loaded via {@link ProfileManager.loadProfile}, which creates
     * live connections as needed. Reuse ProfileManager's existing connection
     * cache by leveraging the global schema view; we still call buildGlobalSchemaView
     * to keep dependencies minimal.
     */
    static compareProfiles(pm: ProfileManager, nameA: string, nameB: string, options?: {
        maxTablesPerProfile?: number;
    }): Promise<SchemaDiffResult>;
}
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