-- GraphRAG plugin initial migration: creates entity_relationships table
CREATE TABLE IF NOT EXISTS entity_relationships (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL,
    source_type VARCHAR(50) NOT NULL,
    source_id UUID NOT NULL,
    target_type VARCHAR(50) NOT NULL,
    target_id UUID NOT NULL,
    relationship_type VARCHAR(50) NOT NULL,
    metadata JSONB DEFAULT '{}'::jsonb,
    owner_id UUID REFERENCES users(id) ON DELETE SET NULL,
    deleted_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);
CREATE INDEX IF NOT EXISTS ix_entity_relationships_source ON entity_relationships(tenant_id, source_type, source_id);
CREATE INDEX IF NOT EXISTS ix_entity_relationships_target ON entity_relationships(tenant_id, target_type, target_id);
CREATE INDEX IF NOT EXISTS ix_entity_relationships_type ON entity_relationships(tenant_id, relationship_type);
CREATE INDEX IF NOT EXISTS ix_entity_relationships_source_target ON entity_relationships(tenant_id, source_type, source_id, target_type, target_id);
CREATE INDEX IF NOT EXISTS ix_entity_relationships_owner ON entity_relationships(owner_id);