CREATE TABLE tenants (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  name VARCHAR(128) NOT NULL,
  slug VARCHAR(64) NOT NULL,
  status VARCHAR(24) NOT NULL DEFAULT 'active',
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), UNIQUE KEY uk_tenants_slug (slug)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE users (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  username VARCHAR(64) NOT NULL,
  password_hash VARCHAR(255) NOT NULL,
  display_name VARCHAR(128) NOT NULL,
  status VARCHAR(24) NOT NULL DEFAULT 'active',
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), UNIQUE KEY uk_users_username (username)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE roles (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  name VARCHAR(64) NOT NULL,
  code VARCHAR(64) NOT NULL,
  permissions JSON NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), UNIQUE KEY uk_roles_tenant_code (tenant_id, code),
  CONSTRAINT fk_roles_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE tenant_members (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  user_id BIGINT UNSIGNED NOT NULL,
  role_id BIGINT UNSIGNED NOT NULL,
  status VARCHAR(24) NOT NULL DEFAULT 'active',
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), UNIQUE KEY uk_tenant_members (tenant_id, user_id),
  CONSTRAINT fk_members_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_members_user FOREIGN KEY (user_id) REFERENCES users(id),
  CONSTRAINT fk_members_role FOREIGN KEY (role_id) REFERENCES roles(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE scenarios (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  name VARCHAR(128) NOT NULL,
  industry VARCHAR(64) NOT NULL,
  role_name VARCHAR(64) NOT NULL,
  goal TEXT NOT NULL,
  trigger_text TEXT NOT NULL,
  visibility VARCHAR(24) NOT NULL DEFAULT 'tenant',
  status VARCHAR(24) NOT NULL DEFAULT 'draft',
  created_by BIGINT UNSIGNED NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), KEY idx_scenarios_tenant_status (tenant_id, status),
  CONSTRAINT fk_scenarios_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_scenarios_creator FOREIGN KEY (created_by) REFERENCES users(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE scenario_fields (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  scenario_id BIGINT UNSIGNED NOT NULL,
  field_key VARCHAR(64) NOT NULL,
  field_name VARCHAR(128) NOT NULL,
  field_type VARCHAR(32) NOT NULL,
  required TINYINT(1) NOT NULL DEFAULT 0,
  options JSON NOT NULL,
  validation JSON NOT NULL,
  sort_order INT NOT NULL DEFAULT 0,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), UNIQUE KEY uk_scenario_fields_key (scenario_id, field_key),
  CONSTRAINT fk_fields_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_fields_scenario FOREIGN KEY (scenario_id) REFERENCES scenarios(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE sops (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  scenario_id BIGINT UNSIGNED NOT NULL,
  name VARCHAR(128) NOT NULL,
  description TEXT NOT NULL,
  status VARCHAR(24) NOT NULL DEFAULT 'draft',
  created_by BIGINT UNSIGNED NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), KEY idx_sops_scenario (tenant_id, scenario_id),
  CONSTRAINT fk_sops_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_sops_scenario FOREIGN KEY (scenario_id) REFERENCES scenarios(id),
  CONSTRAINT fk_sops_creator FOREIGN KEY (created_by) REFERENCES users(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE sop_versions (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  sop_id BIGINT UNSIGNED NOT NULL,
  version INT NOT NULL,
  status VARCHAR(24) NOT NULL DEFAULT 'draft',
  start_node_key VARCHAR(64) NOT NULL DEFAULT '',
  published_at DATETIME(3) NULL,
  created_by BIGINT UNSIGNED NOT NULL,
  reviewed_by BIGINT UNSIGNED NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), UNIQUE KEY uk_sop_versions (sop_id, version),
  CONSTRAINT fk_versions_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_versions_sop FOREIGN KEY (sop_id) REFERENCES sops(id) ON DELETE CASCADE,
  CONSTRAINT fk_versions_creator FOREIGN KEY (created_by) REFERENCES users(id),
  CONSTRAINT fk_versions_reviewer FOREIGN KEY (reviewed_by) REFERENCES users(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE sop_nodes (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  sop_version_id BIGINT UNSIGNED NOT NULL,
  node_key VARCHAR(64) NOT NULL,
  type VARCHAR(32) NOT NULL,
  title VARCHAR(128) NOT NULL,
  content TEXT NOT NULL,
  config JSON NOT NULL,
  position_x INT NOT NULL DEFAULT 0,
  position_y INT NOT NULL DEFAULT 0,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), UNIQUE KEY uk_sop_nodes_key (sop_version_id, node_key),
  CONSTRAINT fk_nodes_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_nodes_version FOREIGN KEY (sop_version_id) REFERENCES sop_versions(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE sop_edges (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  sop_version_id BIGINT UNSIGNED NOT NULL,
  source_node_key VARCHAR(64) NOT NULL,
  target_node_key VARCHAR(64) NOT NULL,
  `condition` JSON NOT NULL,
  priority INT NOT NULL DEFAULT 0,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), KEY idx_sop_edges_source (sop_version_id, source_node_key, priority),
  CONSTRAINT fk_edges_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_edges_version FOREIGN KEY (sop_version_id) REFERENCES sop_versions(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE knowledge_cards (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  scenario_id BIGINT UNSIGNED NOT NULL,
  title VARCHAR(128) NOT NULL,
  status VARCHAR(24) NOT NULL DEFAULT 'draft',
  created_by BIGINT UNSIGNED NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), KEY idx_cards_scenario (tenant_id, scenario_id),
  CONSTRAINT fk_cards_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_cards_scenario FOREIGN KEY (scenario_id) REFERENCES scenarios(id),
  CONSTRAINT fk_cards_creator FOREIGN KEY (created_by) REFERENCES users(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE knowledge_card_versions (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  knowledge_card_id BIGINT UNSIGNED NOT NULL,
  version INT NOT NULL,
  content JSON NOT NULL,
  status VARCHAR(24) NOT NULL DEFAULT 'draft',
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), UNIQUE KEY uk_card_versions (knowledge_card_id, version),
  CONSTRAINT fk_card_versions_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_card_versions_card FOREIGN KEY (knowledge_card_id) REFERENCES knowledge_cards(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE sop_runs (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  sop_id BIGINT UNSIGNED NOT NULL,
  sop_version_id BIGINT UNSIGNED NOT NULL,
  operator_id BIGINT UNSIGNED NOT NULL,
  current_node_key VARCHAR(64) NOT NULL,
  status VARCHAR(24) NOT NULL DEFAULT 'running',
  answers JSON NOT NULL,
  result VARCHAR(64) NOT NULL DEFAULT '',
  started_at DATETIME(3) NOT NULL,
  completed_at DATETIME(3) NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), KEY idx_runs_tenant_status (tenant_id, status),
  CONSTRAINT fk_runs_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_runs_sop FOREIGN KEY (sop_id) REFERENCES sops(id),
  CONSTRAINT fk_runs_version FOREIGN KEY (sop_version_id) REFERENCES sop_versions(id),
  CONSTRAINT fk_runs_operator FOREIGN KEY (operator_id) REFERENCES users(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE sop_run_events (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  run_id BIGINT UNSIGNED NOT NULL,
  node_key VARCHAR(64) NOT NULL,
  action VARCHAR(64) NOT NULL,
  payload JSON NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), KEY idx_run_events (run_id, created_at),
  CONSTRAINT fk_run_events_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_run_events_run FOREIGN KEY (run_id) REFERENCES sop_runs(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE sop_feedback (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  run_id BIGINT UNSIGNED NOT NULL,
  user_id BIGINT UNSIGNED NOT NULL,
  score INT NOT NULL,
  comment TEXT NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), UNIQUE KEY uk_feedback_run_user (run_id, user_id),
  CONSTRAINT fk_feedback_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_feedback_run FOREIGN KEY (run_id) REFERENCES sop_runs(id) ON DELETE CASCADE,
  CONSTRAINT fk_feedback_user FOREIGN KEY (user_id) REFERENCES users(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE audit_logs (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  user_id BIGINT UNSIGNED NOT NULL,
  action VARCHAR(64) NOT NULL,
  resource VARCHAR(64) NOT NULL,
  resource_id BIGINT UNSIGNED NOT NULL,
  payload JSON NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), KEY idx_audit_tenant_time (tenant_id, created_at),
  CONSTRAINT fk_audit_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_audit_user FOREIGN KEY (user_id) REFERENCES users(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE refresh_tokens (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  tenant_id BIGINT UNSIGNED NOT NULL,
  user_id BIGINT UNSIGNED NOT NULL,
  token_hash VARCHAR(64) NOT NULL,
  expires_at DATETIME(3) NOT NULL,
  revoked_at DATETIME(3) NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id), UNIQUE KEY uk_refresh_token_hash (token_hash),
  CONSTRAINT fk_refresh_tenant FOREIGN KEY (tenant_id) REFERENCES tenants(id),
  CONSTRAINT fk_refresh_user FOREIGN KEY (user_id) REFERENCES users(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;