-- AI Assistant plugin migration 0002: chat folders
-- FIX 2026-09-16: ai_chat_attachments and the folder_id ALTER on
-- ai_chat_sessions removed — AI chat moved to comm_conversations/
-- comm_messages (Alembic 0137 dropped the legacy tables). Only the
-- ai_chat_folders table remains (still used for chat folder ordering).

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);