-- AI Assistant plugin migration 0002: chat folders + attachments

CREATE TABLE IF NOT EXISTS ai_chat_folders (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(255) NOT NULL,
    parent_id UUID REFERENCES ai_chat_folders(id) ON DELETE CASCADE,
    user_id UUID NOT NULL,
    tenant_id UUID NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    deleted_at TIMESTAMPTZ
);
CREATE INDEX IF NOT EXISTS ix_ai_folders_user ON ai_chat_folders(user_id);
CREATE INDEX IF NOT EXISTS ix_ai_folders_tenant ON ai_chat_folders(tenant_id);
CREATE INDEX IF NOT EXISTS ix_ai_folders_parent ON ai_chat_folders(parent_id);

ALTER TABLE ai_chat_sessions ADD COLUMN IF NOT EXISTS folder_id UUID REFERENCES ai_chat_folders(id) ON DELETE SET NULL;

CREATE TABLE IF NOT EXISTS ai_chat_attachments (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    message_id UUID REFERENCES ai_chat_messages(id) ON DELETE CASCADE,
    session_id UUID NOT NULL REFERENCES ai_chat_sessions(id) ON DELETE CASCADE,
    filename VARCHAR(255) NOT NULL,
    mime_type VARCHAR(255) NOT NULL DEFAULT 'application/octet-stream',
    size_bytes INTEGER NOT NULL DEFAULT 0,
    storage_path VARCHAR(1024) NOT NULL,
    tenant_id UUID NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    deleted_at TIMESTAMPTZ
);
CREATE INDEX IF NOT EXISTS ix_ai_attachments_message ON ai_chat_attachments(message_id);
CREATE INDEX IF NOT EXISTS ix_ai_attachments_session ON ai_chat_attachments(session_id);
CREATE INDEX IF NOT EXISTS ix_ai_attachments_tenant ON ai_chat_attachments(tenant_id);