export type EntityType = "person" | "project" | "repo" | "file" | "tool" | "channel" | "account" | "concept";
export type Entity = {
    id: number;
    name: string;
    type: EntityType;
    firstSeenMs: number;
    lastSeenMs: number;
    mentionCount: number;
};
/** Upsert an entity. Returns its id. Best-effort; returns 0 on any error. */
export declare function upsertEntity(name: string, type: EntityType): number;
/** Add a relation between two existing entities. Best-effort. */
export declare function addEdge(params: {
    subjectId: number;
    predicate: string;
    objectId: number;
    weight?: number;
}): void;
/**
 * Look up entities matched by name (LIKE). Used by the prompt-builder when
 * a user message contains likely entity references.
 */
export declare function findEntities(name: string, limit?: number): Entity[];
/** Get edges where the entity is subject. */
export declare function getOutgoingEdges(subjectId: number, limit?: number): Array<{
    predicate: string;
    object: Entity;
    weight: number;
}>;
/**
 * Extract entities from a free-form message and persist them. Returns the
 * count of entities upserted. Cheap and synchronous; safe to call on every
 * inbound user message.
 */
export declare function observeMessageForGraph(message: string): number;
/** Build a short prompt section listing graph hits relevant to the message. */
export declare function buildPersonalGraphSection(message: string): string;
/** Test/maintenance helper. Closes the connection so the file can be removed. */
export declare function closeGraphDb(): void;