← All changes | mxchat-basic.php +788 -102 3.2.8 → trunk View file →

		@@ -2,9 +2,9 @@
2	2	/**
3	3	* Plugin Name: MxChat
4	4	* Plugin URI: https://mxchat.ai/
5	5	* Description: AI chatbot for WordPress with OpenAI, Claude, xAI, DeepSeek, live agent, PDF uploads, WooCommerce, and training on website data.
6		- * Version: 3.2.8
	6	+ * Version: 3.2.21
7	7	* Author: MxChat
8	8	* Author URI: https://mxchat.ai
9	9	* License: GPLv2 or later
10	10	* License URI: https://www.gnu.org/licenses/gpl-2.0.html
		@@ -23,8 +23,16 @@
23	23
24	24	if (!defined('MXCHAT_VERSION')) {
25	25	$plugin_data = get_file_data(__FILE__, array('Version' => 'Version'), 'plugin');
26	26	$version = $plugin_data['Version'];
	27	+ // MXCHAT_BASE_VERSION: the plain header version, stable across requests even in
	28	+ // dev mode. Use it for anything PERSISTED or COMPARED (the stored
	29	+ // mxchat_plugin_version option and the migration gate in
	30	+ // mxchat_check_for_update). MXCHAT_VERSION keeps the time() suffix in dev for
	31	+ // ASSET cache-busting only — persisting the suffixed value made the version
	32	+ // comparison churn every request, re-running the full activation/migration
	33	+ // suite per page load on dev installs.
	34	+ define('MXCHAT_BASE_VERSION', $version);
27	35	if (MXCHAT_DEV_MODE) {
28	36	$version .= '.' . time();
29	37	}
30	38	define('MXCHAT_VERSION', $version);
		@@ -29,8 +37,84 @@
29	37	}
30	38	define('MXCHAT_VERSION', $version);
31	39	}
32	40
	41	+/**
	42	+ * Default confidence floor for the in-chat YouTube card, as a percentage
	43	+ * (plan-mxchat-20260813-f52492). Higher than the site-wide Similarity
	44	+ * Threshold default of 35 by design — see MxChat_Utils::video_embed_threshold().
	45	+ * Declared here so the gate, the admin field and the tests all read ONE number.
	46	+ */
	47	+if (!defined('MXCHAT_VIDEO_EMBED_THRESHOLD_DEFAULT')) {
	48	+ define('MXCHAT_VIDEO_EMBED_THRESHOLD_DEFAULT', 55);
	49	+}
	50	+
	51	+/**
	52	+ * One-time install stamp: records the plain version this site first ran, so
	53	+ * behavior defaults can differ between fresh installs and upgrades without
	54	+ * touching anyone's stored settings. Mirrors mxchat-mcp's 1.0.7 stamp shape
	55	+ * (plan 7b578e); first consumer is the "Strip unapproved links" default
	56	+ * (plan 58f8b4). Runs at init priority 1 — BEFORE initialize_default_options
	57	+ * (init 20) writes mxchat_options on a fresh site's first request, because
	58	+ * that option's pre-existing presence is how an upgrade is recognized.
	59	+ */
	60	+function mxchat_stamp_install_version() {
	61	+ if (get_option('mxchat_installed_at_version', '') !== '') {
	62	+ return;
	63	+ }
	64	+ $existing = get_option('mxchat_options', false) !== false;
	65	+ $version = defined('MXCHAT_BASE_VERSION') ? MXCHAT_BASE_VERSION : '0.0.0';
	66	+ update_option('mxchat_installed_at_version', $existing ? 'legacy' : $version, false);
	67	+}
	68	+add_action('init', 'mxchat_stamp_install_version', 1);
	69	+
	70	+/**
	71	+ * Stamp-derived default for the "Strip unapproved links" toggle (plan 58f8b4,
	72	+ * option-c split of the old Citation Links conflation): 'on' only for installs
	73	+ * born at 3.2.20+. A missing or 'legacy' stamp means the site predates the
	74	+ * setting — keep 'off' so no existing site's links start vanishing on update.
	75	+ */
	76	+function mxchat_strip_unapproved_links_default() {
	77	+ $stamp = get_option('mxchat_installed_at_version', '');
	78	+ if ($stamp === '' || $stamp === 'legacy') {
	79	+ return 'off';
	80	+ }
	81	+ return version_compare($stamp, '3.2.20', '>=') ? 'on' : 'off';
	82	+}
	83	+
	84	+/**
	85	+ * Effective state of "Strip unapproved links": an explicitly saved option
	86	+ * always wins; until one exists the install-stamp default governs. Read via
	87	+ * a fresh get_option on purpose — the response URL guard runs late in the
	88	+ * request and must see a value saved moments earlier.
	89	+ */
	90	+function mxchat_strip_unapproved_links_enabled() {
	91	+ $opts = get_option('mxchat_options', array());
	92	+ if (is_array($opts) && isset($opts['strip_unapproved_links_toggle'])) {
	93	+ return $opts['strip_unapproved_links_toggle'] === 'on';
	94	+ }
	95	+ return mxchat_strip_unapproved_links_default() === 'on';
	96	+}
	97	+
	98	+/**
	99	+ * Honest, versioned User-Agent for MXChat remote-content ingestion fetches
	100	+ * (Knowledge Base PDF import, URL import, sitemap / website crawl).
	101	+ *
	102	+ * WAF rulesets (SiteGround/ModSecurity, Wordfence, Cloudflare managed rules)
	103	+ * flag stale spoofed-browser UAs as scrapers and return 403 — which silently
	104	+ * broke the single most common KB source: self-hosted media on the site's own
	105	+ * domain. A truthful crawler identifier is the industry norm for well-behaved
	106	+ * bots and lets a site owner allowlist "MXChatBot" in their WAF. Filterable so
	107	+ * a locked-down host can supply a different string without a code change.
	108	+ */
	109	+if (!function_exists('mxchat_ingest_user_agent')) {
	110	+ function mxchat_ingest_user_agent() {
	111	+ $version = defined('MXCHAT_VERSION') ? MXCHAT_VERSION : '1.0';
	112	+ $ua = 'MXChatBot/' . $version . ' (+https://mxchat.ai/bot)';
	113	+ return apply_filters('mxchat_ingest_user_agent', $ua);
	114	+ }
	115	+}
	116	+
33	117	function mxchat_load_textdomain() {
34	118	$domain = 'mxchat';
35	119	$locale = determine_locale();
36	120
		@@ -89,8 +173,41 @@
89	173	update_option('mxchat_grok_2_remap_done', 1);
90	174	});
91	175
92	176	/**
	177	+ * One-time migration: Anthropic retired the Claude 4 (2025-05-14) snapshots on
	178	+ * June 15, 2026 — claude-opus-4-20250514 and claude-sonnet-4-20250514 now return
	179	+ * an API error. Existing installs with a dead ID get auto-remapped to the current
	180	+ * equivalents Anthropic recommends (Opus 4.8 / Sonnet 4.6) the first time admin_init
	181	+ * fires after update. Mirrors the gemini-3-pro-preview / grok-2 rescues above.
	182	+ */
	183	+add_action('admin_init', function () {
	184	+ if (get_option('mxchat_claude_4_retire_remap_done')) {
	185	+ return;
	186	+ }
	187	+ $map = array(
	188	+ 'claude-opus-4-20250514' => 'claude-opus-4-8',
	189	+ 'claude-sonnet-4-20250514' => 'claude-sonnet-4-6',
	190	+ );
	191	+ $opts = get_option('mxchat_options');
	192	+ if (is_array($opts)) {
	193	+ $changed = false;
	194	+ if (isset($opts['model']) && isset($map[$opts['model']])) {
	195	+ $opts['model'] = $map[$opts['model']];
	196	+ $changed = true;
	197	+ }
	198	+ if (isset($opts['content_model']) && isset($map[$opts['content_model']])) {
	199	+ $opts['content_model'] = $map[$opts['content_model']];
	200	+ $changed = true;
	201	+ }
	202	+ if ($changed) {
	203	+ update_option('mxchat_options', $opts);
	204	+ }
	205	+ }
	206	+ update_option('mxchat_claude_4_retire_remap_done', 1);
	207	+});
	208	+
	209	+/**
93	210	* Exclude MxChat assets from caching plugin optimizations
94	211	*
95	212	* This prevents issues with WP Rocket, LiteSpeed Cache, Autoptimize, WP Super Cache,
96	213	* W3 Total Cache, SG Optimizer, and similar plugins that may break the chatbot by
		@@ -349,21 +466,32 @@
349	466
350	467	// Include classes with error handling
351	468	function mxchat_include_classes() {
352	469	$class_files = array(
	470	+ 'includes/class-mxchat-model-catalog.php',
	471	+ 'includes/class-mxchat-model-liveness.php',
	472	+ 'includes/class-mxchat-session-store.php',
	473	+ 'includes/class-mxchat-live-agent-schedule.php',
	474	+ 'includes/class-mxchat-tool-registry.php',
353	475	'includes/class-mxchat-integrator.php',
354	476	'includes/class-mxchat-admin.php',
355	477	'includes/class-mxchat-public.php',
	478	+ 'includes/class-mxchat-block.php',
	479	+ 'includes/class-mxchat-elementor.php',
356	480	'includes/class-mxchat-utils.php',
357	481	'includes/class-mxchat-user.php',
	482	+ 'includes/class-mxchat-privacy.php',
358	483	'includes/class-mxchat-meta-box.php',
359	484	'includes/class-mxchat-chunker.php',
360	485	'includes/class-mxchat-word-handler.php',
361	486	'includes/class-mxchat-content-generator.php',
	487	+ 'includes/class-mxchat-cache-purge.php',
	488	+ 'includes/class-mxchat-editor-assistant.php',
362	489	'includes/class-rest-api.php',
363	490	'admin/class-ajax-handler.php',
364	491	'admin/class-pinecone-manager.php',
365		- 'admin/class-knowledge-manager.php'
	492	+ 'admin/class-knowledge-manager.php',
	493	+ 'admin/class-vectorstore-manager.php'
366	494	);
367	495
368	496	foreach ($class_files as $file) {
369	497	$file_path = plugin_dir_path(__FILE__) . $file;
		@@ -373,8 +501,59 @@
373	501	//error_log('MxChat: Missing class file - ' . $file);
374	502	}
375	503	}
376	504
	505	+ // Register the native function-calling admin-post save handler (a41dee).
	506	+ if (class_exists('MxChat_Tool_Registry')) {
	507	+ MxChat_Tool_Registry::init();
	508	+ }
	509	+
	510	+ // GDPR: register with WP's personal-data export/erase tools (b81e42).
	511	+ if (class_exists('MxChat_Privacy')) {
	512	+ MxChat_Privacy::init();
	513	+ }
	514	+
	515	+ // Per-session state store: retention cron + the cron-independent
	516	+ // migration drain off admin_init (b64b77).
	517	+ if (class_exists('MxChat_Session_Store')) {
	518	+ MxChat_Session_Store::init();
	519	+ }
	520	+
	521	+ // Daily model-liveness check + its warning notice (b65e8d). Read-only and
	522	+ // fail-open: one listing request per in-use provider per day, none at all
	523	+ // when no key is stored.
	524	+ if (class_exists('MxChat_Model_Liveness')) {
	525	+ MxChat_Model_Liveness::init();
	526	+ }
	527	+
	528	+ // Gutenberg chatbot block (plan-95dd1e): a click-to-place wrapper over the
	529	+ // [mxchat_chatbot] shortcode. Registers on init; no-op below WP 5.0.
	530	+ if (class_exists('MxChat_Block')) {
	531	+ MxChat_Block::init();
	532	+ }
	533	+
	534	+ // Elementor chatbot widget (plan-95dd1e part 2): registered ONLY inside
	535	+ // elementor/widgets/register (Elementor >= 3.5) — with Elementor absent or
	536	+ // older, the hook never fires and nothing further loads.
	537	+ if (class_exists('MxChat_Elementor')) {
	538	+ MxChat_Elementor::init();
	539	+ }
	540	+
	541	+ // Editor Assistant — free, OFF-by-default block-editor AI actions (plan-8cb0cb).
	542	+ // init() wires REST + streaming AJAX + sidebar enqueue ONLY when the
	543	+ // mxchat_editor_assistant_enabled option is 'on'; otherwise zero footprint.
	544	+ if (class_exists('MxChat_Editor_Assistant')) {
	545	+ MxChat_Editor_Assistant::init();
	546	+ }
	547	+
	548	+ // OpenAI Vector Store write path (plan-15b5c6): import/sync AJAX, the
	549	+ // import cron tick, the pending-delete sweeper, and the WP-CLI command
	550	+ // all register in the constructor. The sync itself only runs when the
	551	+ // sync toggle + store ID + OpenAI key are all present.
	552	+ if (class_exists('MxChat_Vectorstore_Manager')) {
	553	+ MxChat_Vectorstore_Manager::get_instance();
	554	+ }
	555	+
377	556	// Admin pages that aren't classes (procedural include).
378	557	if (is_admin()) {
379	558	$admin_api_page = plugin_dir_path(__FILE__) . 'includes/admin-api-page.php';
380	559	if (file_exists($admin_api_page)) {
		@@ -436,8 +615,26 @@
436	615	dbDelta($sql);
437	616	}
438	617
439	618	/**
	619	+ * Create the per-session state table (b64b77).
	620	+ *
	621	+ * Callable from the activation hook, which can run before plugins_loaded has
	622	+ * included the class files — so it loads the class itself when needed.
	623	+ */
	624	+function mxchat_create_sessions_table() {
	625	+ if (!class_exists('MxChat_Session_Store')) {
	626	+ $path = plugin_dir_path(__FILE__) . 'includes/class-mxchat-session-store.php';
	627	+ if (!file_exists($path)) {
	628	+ return false;
	629	+ }
	630	+ require_once $path;
	631	+ }
	632	+
	633	+ return MxChat_Session_Store::create_table();
	634	+}
	635	+
	636	+/**
440	637	* FIXED: Robust table creation and column management
441	638	*/
442	639	function mxchat_create_chat_transcripts_table() {
443	640	global $wpdb;
		@@ -748,8 +945,66 @@
748	945	}
749	946	}
750	947
751	948	/**
	949	+ * 3.2.20: One-time backfill of the caee10 catalog usage-hint defaults
	950	+ * (plan 64c1ad). persist() writes usage_hint for EVERY shown tool on every
	951	+ * autosave — as '' when the box is untouched — and resolve_tool_setting()
	952	+ * seeds a catalog default_hint ONLY onto an ABSENT key. So any install that
	953	+ * saved the AI Tools screen before 3.2.20 holds '' everywhere and the shipped
	954	+ * defaults can never reach it. On an upgrade from < 3.2.20 an empty stored
	955	+ * hint cannot be a deliberate clear of a rendered default (those builds never
	956	+ * rendered one), so seeding is safe. From 3.2.20 on, empty means the owner
	957	+ * cleared a visible default and is respected — this never runs again (version
	958	+ * gate + its own marker, deliberately not caee10's flag).
	959	+ *
	960	+ * Never touched: entries with owner text, legacy bare-bool entries and
	961	+ * absent-key entries (both already resolve to the default at read time), and
	962	+ * tools whose catalog entry ships no default_hint.
	963	+ */
	964	+function mxchat_backfill_tool_hint_defaults() {
	965	+ if (get_option('mxchat_tool_hint_backfill_64c1ad') === '1') {
	966	+ return;
	967	+ }
	968	+
	969	+ if (class_exists('MxChat_Tool_Registry')) {
	970	+ $map = get_option('mxchat_function_calling_tools', array());
	971	+ if (is_array($map) && !empty($map)) {
	972	+ $defaults = array();
	973	+ foreach (MxChat_Tool_Registry::core_tool_catalog() as $fn => $meta) {
	974	+ if (!empty($meta['default_hint'])) {
	975	+ $defaults[$fn] = (string) $meta['default_hint'];
	976	+ }
	977	+ }
	978	+
	979	+ $changed = false;
	980	+ foreach ($map as $fn => $entry) {
	981	+ if (!isset($defaults[$fn])) {
	982	+ continue; // no catalog default — nothing to seed
	983	+ }
	984	+ if (!is_array($entry)) {
	985	+ continue; // legacy bare bool: key absent, resolves to the default already
	986	+ }
	987	+ if (!array_key_exists('usage_hint', $entry)) {
	988	+ continue; // absent key gets the default at read time — must stay absent
	989	+ }
	990	+ if (trim((string) $entry['usage_hint']) !== '') {
	991	+ continue; // owner text — never touch
	992	+ }
	993	+ $map[$fn]['usage_hint'] = $defaults[$fn];
	994	+ $changed = true;
	995	+ }
	996	+
	997	+ if ($changed) {
	998	+ update_option('mxchat_function_calling_tools', $map);
	999	+ }
	1000	+ }
	1001	+ }
	1002	+
	1003	+ update_option('mxchat_tool_hint_backfill_64c1ad', '1', false);
	1004	+}
	1005	+
	1006	+/**
752	1007	* 2.5.2: Create queue processing tables for reliable background processing
753	1008	*/
754	1009	function mxchat_create_queue_tables() {
755	1010	global $wpdb;
		@@ -847,8 +1102,41 @@
847	1102	dbDelta($sql);
848	1103	}
849	1104
850	1105	/**
	1106	+ * Create the OpenAI Vector Store file-mapping table (v3.2.20, plan 15b5c6).
	1107	+ * One row per mirrored KB entry: which store, which bot, which OpenAI file id,
	1108	+ * and a hash of the uploaded body for change detection. Vector store files are
	1109	+ * not patchable in place — without this mapping an update cannot find its
	1110	+ * predecessor, and the store silently accumulates stale duplicates.
	1111	+ * status: 'live' (serving) or 'pending_delete' (condemned, swept later).
	1112	+ */
	1113	+function mxchat_create_vectorstore_files_table() {
	1114	+ global $wpdb;
	1115	+ $charset_collate = $wpdb->get_charset_collate();
	1116	+
	1117	+ $table_name = $wpdb->prefix . 'mxchat_vectorstore_files';
	1118	+ $sql = "CREATE TABLE $table_name (
	1119	+ id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
	1120	+ store_id varchar(64) NOT NULL,
	1121	+ bot_id varchar(64) NOT NULL DEFAULT 'default',
	1122	+ entry_key char(32) NOT NULL,
	1123	+ source_url text,
	1124	+ file_id varchar(64) NOT NULL,
	1125	+ content_hash char(32) NOT NULL DEFAULT '',
	1126	+ status varchar(20) NOT NULL DEFAULT 'live',
	1127	+ last_error text,
	1128	+ updated_at datetime DEFAULT NULL,
	1129	+ PRIMARY KEY (id),
	1130	+ KEY store_entry (store_id, bot_id, entry_key, status),
	1131	+ KEY status (status)
	1132	+ ) $charset_collate;";
	1133	+
	1134	+ require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
	1135	+ dbDelta($sql);
	1136	+}
	1137	+
	1138	+/**
851	1139	* 2.5.2: Fix URL column size to support long URLs (especially with UTF-8 encoding)
852	1140	* This fixes "url, source_url. The supplied values may be too long" errors
853	1141	*/
854	1142	function mxchat_fix_url_column_size() {
		@@ -892,53 +1180,45 @@
892	1180	if (!isset($options['model'])) {
893	1181	return;
894	1182	}
895	1183
896		- $current_model = $options['model'];
897		-
898		- // Migrate deprecated Claude models to Claude Opus 4.6 (recommended replacement per Anthropic)
899		- $deprecated_claude_models = array(
900		- 'claude-3-5-sonnet-20240620', // Retired Oct 28, 2025
901		- 'claude-3-5-sonnet-20241022', // Retired Oct 28, 2025
902		- 'claude-3-7-sonnet-20250219', // Retiring Feb 19, 2026
903		- 'claude-3-opus-20240229', // Retired Jan 5, 2026
904		- 'claude-3-sonnet-20240229', // Legacy
905		- 'claude-3-haiku-20240307', // Legacy
906		- );
907		- if (in_array($current_model, $deprecated_claude_models, true)) {
908		- $options['model'] = 'claude-opus-4-6';
909		- $migrated = true;
910		- $migration_message = sprintf(
911		- 'Your chatbot model has been automatically updated from %s to Claude Opus 4.6 due to Anthropic deprecating older Claude models.',
912		- $current_model
913		- );
	1184	+ // The retired-id → replacement mapping lives in ONE place:
	1185	+ // MxChat_Model_Catalog::retired_model_map() (plan 202df5). This function
	1186	+ // and every add-on that stores model ids consume that map — do not add a
	1187	+ // deprecation list here again.
	1188	+ if (!class_exists('MxChat_Model_Catalog') || !method_exists('MxChat_Model_Catalog', 'retired_model_map')) {
	1189	+ return; // catalog not loaded (defensive) — the next admin load retries
914	1190	}
	1191	+ $map = MxChat_Model_Catalog::retired_model_map();
915	1192
916		- // Migrate deprecated Claude Haiku 3.5 to Claude Haiku 4.5
917		- if ($current_model === 'claude-3-5-haiku-20241022') {
918		- $options['model'] = 'claude-haiku-4-5-20251001';
	1193	+ $current_model = $options['model'];
	1194	+ if (isset($map[$current_model])) {
	1195	+ $entry = $map[$current_model];
	1196	+ $options['model'] = $entry['to'];
919	1197	$migrated = true;
920		- $migration_message = 'Your chatbot model has been automatically updated from Claude Haiku 3.5 to Claude Haiku 4.5 due to Anthropic deprecating the older model.';
921		- }
922		-
923		- // Migrate deprecated GPT-4 series and GPT-3.5 Turbo to GPT-5.1 Chat Latest
924		- if (in_array($current_model, array('gpt-4o', 'gpt-4.1-2025-04-14', 'gpt-4-turbo', 'gpt-4', 'gpt-3.5-turbo'), true)) {
925		- $options['model'] = 'gpt-5.1-chat-latest';
926		- $migrated = true;
927	1198	$migration_message = sprintf(
928		- 'Your chatbot model has been automatically updated from %s to GPT-5.1 Chat Latest due to OpenAI deprecating older models.',
929		- $current_model
	1199	+ 'Your chatbot model has been automatically updated from %s to %s %s.',
	1200	+ $current_model,
	1201	+ $entry['label'],
	1202	+ $entry['reason']
930	1203	);
931	1204	}
932	1205
933		- // Migrate deprecated GPT-4o Mini and GPT-4.1 Mini to GPT-5 Mini
934		- if (in_array($current_model, array('gpt-4o-mini', 'gpt-4.1-mini'), true)) {
935		- $options['model'] = 'gpt-5-mini';
	1206	+ // The content generator has its own model option — the same map applies.
	1207	+ // (Pre-202df5 this branch covered only the two gpt-5.x-chat-latest aliases;
	1208	+ // it now covers every retired id, so e.g. a content model stranded on a
	1209	+ // retired Claude id is rescued the same way the chat model is.)
	1210	+ if (isset($options['content_model']) && isset($map[$options['content_model']])) {
	1211	+ $old_content_model = $options['content_model'];
	1212	+ $entry = $map[$old_content_model];
	1213	+ $options['content_model'] = $entry['to'];
936	1214	$migrated = true;
937		- $migration_message = sprintf(
938		- 'Your chatbot model has been automatically updated from %s to GPT-5 Mini due to OpenAI deprecating GPT-4 series models.',
939		- $current_model
940		- );
	1215	+ $migration_message = trim($migration_message . ' ' . sprintf(
	1216	+ 'Your content generation model has also been automatically updated from %s to %s %s.',
	1217	+ $old_content_model,
	1218	+ $entry['label'],
	1219	+ $entry['reason']
	1220	+ ));
941	1221	}
942	1222
943	1223	if ($migrated) {
944	1224	update_option('mxchat_options', $options);
		@@ -965,8 +1245,100 @@
965	1245	delete_option('mxchat_model_migration_message');
966	1246	}
967	1247	}
968	1248
	1249	+/**
	1250	+ * One-time recommendation on EXISTING installs (stamp 'legacy') that the new
	1251	+ * "Strip unapproved links" guard exists and is worth turning on (plan 58f8b4).
	1252	+ * Fresh 3.2.20+ installs default it on and never see this. Shown only on
	1253	+ * MxChat admin pages, gone for good once dismissed or once the site saves an
	1254	+ * explicit value for the toggle either way.
	1255	+ */
	1256	+function mxchat_show_strip_links_notice() {
	1257	+ if (!current_user_can('manage_options')) {
	1258	+ return;
	1259	+ }
	1260	+ $page = isset($_GET['page']) ? sanitize_key($_GET['page']) : '';
	1261	+ if (strpos($page, 'mxchat') !== 0) {
	1262	+ return;
	1263	+ }
	1264	+ if (get_option('mxchat_strip_links_notice_dismissed', '') === '1') {
	1265	+ return;
	1266	+ }
	1267	+ if (get_option('mxchat_installed_at_version', '') !== 'legacy') {
	1268	+ return;
	1269	+ }
	1270	+ $opts = get_option('mxchat_options', array());
	1271	+ if (is_array($opts) && isset($opts['strip_unapproved_links_toggle'])) {
	1272	+ return; // The site already made its choice — stop recommending.
	1273	+ }
	1274	+ $dismiss_url = wp_nonce_url(
	1275	+ admin_url('admin-post.php?action=mxchat_dismiss_strip_links_notice'),
	1276	+ 'mxchat_dismiss_strip_links_notice'
	1277	+ );
	1278	+ ?>
	1279	+ <div class="notice notice-info">
	1280	+ <p>
	1281	+ <strong><?php esc_html_e('MxChat: new link protection available', 'mxchat'); ?></strong><br>
	1282	+ <?php esc_html_e('The new "Strip Unapproved Links" setting removes links the AI invents from its answers even when Citation Links is off — links to real pages on your site and links your integrations return are always kept. It is off on existing sites so nothing changes without you; we recommend turning it on under MxChat → Settings → Chatbot Behavior.', 'mxchat'); ?>
	1283	+ <a href="<?php echo esc_url($dismiss_url); ?>"><?php esc_html_e('Dismiss', 'mxchat'); ?></a>
	1284	+ </p>
	1285	+ </div>
	1286	+ <?php
	1287	+}
	1288	+add_action('admin_notices', 'mxchat_show_strip_links_notice');
	1289	+
	1290	+/** Dismiss handler for the strip-links recommendation notice (plan 58f8b4). */
	1291	+function mxchat_dismiss_strip_links_notice() {
	1292	+ if (!current_user_can('manage_options')) {
	1293	+ wp_die(esc_html__('Insufficient permissions.', 'mxchat'), '', array('response' => 403));
	1294	+ }
	1295	+ check_admin_referer('mxchat_dismiss_strip_links_notice');
	1296	+ update_option('mxchat_strip_links_notice_dismissed', '1', false);
	1297	+ $referer = wp_get_referer();
	1298	+ wp_safe_redirect($referer ? $referer : admin_url('admin.php?page=mxchat-max'));
	1299	+ exit;
	1300	+}
	1301	+add_action('admin_post_mxchat_dismiss_strip_links_notice', 'mxchat_dismiss_strip_links_notice');
	1302	+
	1303	+/**
	1304	+ * Persistent admin notice when the provider rejected the configured model
	1305	+ * (model_not_found / no access). Set by mxchat_friendly_chat_error() in the
	1306	+ * integrator whenever a chat request fails on a model-access error — including
	1307	+ * requests from anonymous visitors, which is the case that otherwise stays
	1308	+ * invisible to the site owner for weeks (plan e46b8f).
	1309	+ *
	1310	+ * Deleted after render so it re-arms on the next failed chat: the notice keeps
	1311	+ * reappearing until the model is fixed, then stops on its own.
	1312	+ */
	1313	+function mxchat_show_model_access_notice() {
	1314	+ if (!current_user_can('manage_options')) {
	1315	+ return;
	1316	+ }
	1317	+ $notice = get_option('mxchat_model_access_notice');
	1318	+ if (!is_array($notice) || empty($notice['model'])) {
	1319	+ return;
	1320	+ }
	1321	+ $settings_url = admin_url('admin.php?page=mxchat-max');
	1322	+ ?>
	1323	+ <div class="notice notice-error is-dismissible">
	1324	+ <p>
	1325	+ <strong><?php esc_html_e('MxChat: your AI model is being rejected by the provider', 'mxchat'); ?></strong><br>
	1326	+ <?php
	1327	+ printf(
	1328	+ /* translators: 1: model id, 2: provider name */
	1329	+ esc_html__('Chat requests using the model "%1$s" are failing because %2$s reports it as unavailable on your API key (it may have been retired). Visitors may be seeing errors instead of replies.', 'mxchat'),
	1330	+ esc_html($notice['model']),
	1331	+ esc_html(!empty($notice['provider']) ? $notice['provider'] : __('the AI provider', 'mxchat'))
	1332	+ );
	1333	+ ?>
	1334	+ <a href="<?php echo esc_url($settings_url); ?>"><?php esc_html_e('Choose a different model in MxChat Settings', 'mxchat'); ?></a>
	1335	+ </p>
	1336	+ </div>
	1337	+ <?php
	1338	+ delete_option('mxchat_model_access_notice');
	1339	+}
	1340	+
969	1341	function mxchat_activate() {
970	1342	global $wpdb;
971	1343	$charset_collate = $wpdb->get_charset_collate();
972	1344
		@@ -974,8 +1346,12 @@
974	1346
975	1347	// Create chat transcripts table with improved function
976	1348	mxchat_create_chat_transcripts_table();
977	1349
	1350	+ // Per-session state table (b64b77). Activation can run before
	1351	+ // plugins_loaded has included the class files, so require it directly.
	1352	+ mxchat_create_sessions_table();
	1353	+
978	1354	// System Prompt Content Table - UPDATED: Use TEXT for url and source_url columns
979	1355	$system_prompt_table = $wpdb->prefix . 'mxchat_system_prompt_content';
980	1356	$sql_system_prompt = "CREATE TABLE $system_prompt_table (
981	1357	id MEDIUMINT(9) NOT NULL AUTO_INCREMENT,
		@@ -1037,8 +1413,11 @@
1037	1413
1038	1414	// Create per-session satisfaction ratings table (v3.2.6)
1039	1415	mxchat_create_session_ratings_table();
1040	1416
	1417	+ // Create Vector Store file-mapping table (v3.2.20, plan 15b5c6)
	1418	+ mxchat_create_vectorstore_files_table();
	1419	+
1041	1420	// Ensure additional columns in system prompt table
1042	1421	$existing_system_columns = $wpdb->get_results("SHOW COLUMNS FROM $system_prompt_table");
1043	1422	if (!empty($existing_system_columns)) {
1044	1423	$existing_system_column_names = array_column($existing_system_columns, 'Field');
		@@ -1087,10 +1466,11 @@
1087	1466
1088	1467	// Setup cron jobs
1089	1468	mxchat_setup_cron_jobs();
1090	1469
1091		- // Update version
1092		- update_option('mxchat_plugin_version', MXCHAT_VERSION);
	1470	+ // Update version (stable base version — never the dev time()-suffixed one,
	1471	+ // or the check_for_update comparison would churn every request)
	1472	+ update_option('mxchat_plugin_version', MXCHAT_BASE_VERSION);
1093	1473
1094	1474	//error_log("MxChat: Activation function completed");
1095	1475	}
1096	1476
		@@ -1105,23 +1485,29 @@
1105	1485	if (defined('DISABLE_WP_CRON') && DISABLE_WP_CRON) {
1106	1486	// Set flag to use fallback system
1107	1487	update_option('mxchat_use_fallback_rate_limits', true);
1108	1488	update_option('mxchat_next_rate_limit_check', time() + 3600);
1109		- return;
1110		- }
1111		-
1112		- // Schedule the rate limit reset cron job
1113		- $result = wp_schedule_event(time() + 300, 'hourly', 'mxchat_reset_rate_limits');
1114		-
1115		- if ($result === false) {
1116		- // Fallback if scheduling fails
1117		- update_option('mxchat_use_fallback_rate_limits', true);
1118		- update_option('mxchat_next_rate_limit_check', time() + 3600);
	1489	+ // Deliberately NO early return (plan-bc08a6): transcript cleanup below
	1490	+ // must still be scheduled. DISABLE_WP_CRON only changes HOW cron events
	1491	+ // execute (a server-side runner hitting wp-cron.php instead of loopback
	1492	+ // spawns) — scheduling still just writes the cron option. The old early
	1493	+ // return here meant a deactivate/reactivate cycle on a DISABLE_WP_CRON
	1494	+ // site permanently lost the transcript cleanup event while the retention
	1495	+ // setting still claimed to be active.
1119	1496	} else {
1120		- // Clear fallback flags if cron scheduling succeeded
1121		- delete_option('mxchat_use_fallback_rate_limits');
	1497	+ // Schedule the rate limit reset cron job
	1498	+ $result = wp_schedule_event(time() + 300, 'hourly', 'mxchat_reset_rate_limits');
	1499	+
	1500	+ if ($result === false) {
	1501	+ // Fallback if scheduling fails
	1502	+ update_option('mxchat_use_fallback_rate_limits', true);
	1503	+ update_option('mxchat_next_rate_limit_check', time() + 3600);
	1504	+ } else {
	1505	+ // Clear fallback flags if cron scheduling succeeded
	1506	+ delete_option('mxchat_use_fallback_rate_limits');
	1507	+ }
1122	1508	}
1123		-
	1509	+
1124	1510	// Schedule transcript cleanup if configured (bucket dropdown OR custom retention-days > 0)
1125	1511	$transcript_options = get_option('mxchat_transcripts_options', array());
1126	1512	$cleanup_interval = isset($transcript_options['mxchat_auto_delete_transcripts']) ? $transcript_options['mxchat_auto_delete_transcripts'] : 'never';
1127	1513	$custom_retention = isset($transcript_options['mxchat_retention_days']) ? (int) $transcript_options['mxchat_retention_days'] : 0;
		@@ -1143,8 +1529,9 @@
1143	1529	// Clear scheduled cron jobs
1144	1530	wp_clear_scheduled_hook('mxchat_reset_rate_limits');
1145	1531	wp_clear_scheduled_hook('mxchat_cleanup_old_transcripts');
1146	1532	wp_clear_scheduled_hook('mxchat_send_delayed_transcript');
	1533	+ wp_clear_scheduled_hook('mxchat_model_liveness_check');
1147	1534
1148	1535	// Clear fallback options
1149	1536	delete_option('mxchat_use_fallback_rate_limits');
1150	1537	delete_option('mxchat_next_rate_limit_check');
		@@ -1164,17 +1551,25 @@
1164	1551	return;
1165	1552	}
1166	1553
1167	1554	$next_check = get_option('mxchat_next_rate_limit_check', 0);
1168		-
	1555	+
1169	1556	if (time() >= $next_check) {
1170		- // Only run reset if the MxChat_Integrator class exists
1171		- if (class_exists('MxChat_Integrator')) {
1172		- $integrator = new MxChat_Integrator();
1173		- if (method_exists($integrator, 'mxchat_reset_rate_limits')) {
1174		- $integrator->mxchat_reset_rate_limits();
1175		- update_option('mxchat_next_rate_limit_check', time() + 3600);
1176		- }
	1557	+ // Reuse the bootstrap's integrator — mxchat_init() creates the global on
	1558	+ // plugins_loaded (before this init-priority-5 callback), so it's always set
	1559	+ // here. Constructing a second MxChat_Integrator just to call one method
	1560	+ // re-registers every hook the plugin has (ajax pairs, wp_footer loader,
	1561	+ // rest_api_init, admin_init guard) on a duplicate instance for the rest of
	1562	+ // the request. Defensive construction only if the global is somehow unset.
	1563	+ // NOTE: MxChat_Integrator::check_fallback_rate_limits() is a second
	1564	+ // implementation of this same check — if either changes, change both.
	1565	+ global $mxchat_integrator;
	1566	+ $integrator = ($mxchat_integrator instanceof MxChat_Integrator)
	1567	+ ? $mxchat_integrator
	1568	+ : (class_exists('MxChat_Integrator') ? new MxChat_Integrator() : null);
	1569	+ if ($integrator && method_exists($integrator, 'mxchat_reset_rate_limits')) {
	1570	+ $integrator->mxchat_reset_rate_limits();
	1571	+ update_option('mxchat_next_rate_limit_check', time() + 3600);
1177	1572	}
1178	1573	}
1179	1574	}
1180	1575
		@@ -1186,9 +1581,9 @@
1186	1581	global $wpdb;
1187	1582
1188	1583	try {
1189	1584	$current_version = get_option('mxchat_plugin_version', '0.0.0');
1190		- $plugin_version = MXCHAT_VERSION;
	1585	+ $plugin_version = MXCHAT_BASE_VERSION;
1191	1586
1192	1587	// Always ensure critical tables exist (even if version matches)
1193	1588	// This handles manual table deletion or fresh installs
1194	1589	$chat_table = $wpdb->prefix . 'mxchat_chat_transcripts';
		@@ -1193,12 +1588,16 @@
1193	1588	// This handles manual table deletion or fresh installs
1194	1589	$chat_table = $wpdb->prefix . 'mxchat_chat_transcripts';
1195	1590	$queue_table = $wpdb->prefix . 'mxchat_processing_queue';
1196	1591
	1592	+ $sessions_table = $wpdb->prefix . 'mxchat_sessions';
	1593	+
1197	1594	$chat_exists = $wpdb->get_var("SHOW TABLES LIKE '$chat_table'") === $chat_table;
1198	1595	$queue_exists = $wpdb->get_var("SHOW TABLES LIKE '$queue_table'") === $queue_table;
1199		-
1200		- if (!$chat_exists || !$queue_exists) {
	1596	+ $sessions_exists = get_option('mxchat_session_store_ready') === '1'
	1597	+ || $wpdb->get_var("SHOW TABLES LIKE '$sessions_table'") === $sessions_table;
	1598	+
	1599	+ if (!$chat_exists || !$queue_exists || !$sessions_exists) {
1201	1600	//error_log("MxChat: Critical tables missing, running activation");
1202	1601	mxchat_activate();
1203	1602	}
1204	1603
		@@ -1267,8 +1666,55 @@
1267	1666	if (version_compare($current_version, '3.2.4', '<')) {
1268	1667	mxchat_backfill_active_embedding_model();
1269	1668	}
1270	1669
	1670	+ // 3.2.15: Migrate retired DeepSeek ids (deepseek-chat / deepseek-reasoner
	1671	+ // were shut off at the vendor on 2026-07-24). The function is idempotent —
	1672	+ // it only rewrites models on its deprecation lists.
	1673	+ if (version_compare($current_version, '3.2.15', '<')) {
	1674	+ mxchat_migrate_deprecated_models();
	1675	+ }
	1676	+
	1677	+ // 3.2.16: Migrate OpenAI ids retiring 2026-08-10 (gpt-5.1-chat-latest /
	1678	+ // gpt-5.3-chat-latest → gpt-5.6-sol per OpenAI's deprecations page).
	1679	+ // Idempotent — only rewrites models on the deprecation lists (e46b8f).
	1680	+ if (version_compare($current_version, '3.2.16', '<')) {
	1681	+ mxchat_migrate_deprecated_models();
	1682	+ }
	1683	+
	1684	+ // 3.2.17: Credential options must not autoload (af2400) — the two
	1685	+ // Pinecone-secret-holding rows were in alloptions, i.e. read into
	1686	+ // memory on every request including anonymous page views. Idempotent.
	1687	+ // Also carry the import modal's remembered ACF→PDF checkbox state
	1688	+ // into the new install-level option (11720c).
	1689	+ if (version_compare($current_version, '3.2.17', '<')) {
	1690	+ mxchat_fix_credential_option_autoload();
	1691	+ mxchat_migrate_acf_pdf_extraction_option();
	1692	+ }
	1693	+
	1694	+ // 3.2.19: Claude Opus 4.1 retired Aug 5, 2026 — auto-move stranded
	1695	+ // sites (and the older tiers on the migration's lists) per the
	1696	+ // changelog's promise. Idempotent — only rewrites models on the
	1697	+ // deprecation lists. Without a gate at this release's version,
	1698	+ // nothing calls the migration for 3.2.18 upgraders (plan a5a598;
	1699	+ // the gate value must equal the version this block ships in).
	1700	+ if (version_compare($current_version, '3.2.19', '<')) {
	1701	+ mxchat_migrate_deprecated_models();
	1702	+ }
	1703	+
	1704	+ // 3.2.20: Seed the caee10 usage-hint defaults onto tool entries a
	1705	+ // pre-3.2.20 autosave stamped with '' (plan 64c1ad). The gate value
	1706	+ // equals the version this block ships in (a5a598 rule); the
	1707	+ // function carries its own one-time marker on top.
	1708	+ // Also re-run the deprecated-models migration: 202df5 widened it to
	1709	+ // rescue a content_model stranded on ANY retired id (previously
	1710	+ // only the two gpt-5.x-chat-latest aliases). Idempotent — only
	1711	+ // rewrites models on the catalog's retired_model_map().
	1712	+ if (version_compare($current_version, '3.2.20', '<')) {
	1713	+ mxchat_backfill_tool_hint_defaults();
	1714	+ mxchat_migrate_deprecated_models();
	1715	+ }
	1716	+
1271	1717	// Run full activation to ensure everything is up to date
1272	1718	mxchat_activate();
1273	1719
1274	1720	// Run migration functions
		@@ -1273,12 +1719,11 @@
1273	1719
1274	1720	// Run migration functions
1275	1721	mxchat_migrate_live_agent_status();
1276	1722
1277		- // Add the cleanup function for version 2.1.8
1278		- if (version_compare($current_version, '2.1.8', '<')) {
1279		- $deleted = mxchat_cleanup_orphaned_chat_history();
1280		- }
	1723	+ // (The 2.1.8 orphaned-history reconciliation sweep is gone —
	1724	+ // 3.2.19's mxchat_history_backlog_* drain supersedes it, and it
	1725	+ // self-arms without a version gate: plan 839c4c.)
1281	1726
1282	1727	// Update version LAST
1283	1728	update_option('mxchat_plugin_version', $plugin_version);
1284	1729
		@@ -1291,8 +1736,170 @@
1291	1736	}
1292	1737	}
1293	1738
1294	1739	/**
	1740	+ * Credential options must never enter the autoloaded alloptions set.
	1741	+ * mxchat_prompts_options and mxchat_pinecone_addon_options can hold the
	1742	+ * Pinecone API secret; mxchat_options already stores its keys with autoload
	1743	+ * off and these two must match it. The filter covers every future
	1744	+ * add_option()/update_option() that creates the row — Settings API saves
	1745	+ * through options.php and WP-CLI included — on WP 6.6+; older cores are
	1746	+ * covered by the explicit autoload arguments at the plugin's own write
	1747	+ * sites plus the one-time migration below.
	1748	+ */
	1749	+add_filter('wp_default_autoload_value', 'mxchat_credential_option_autoload_value', 10, 2);
	1750	+function mxchat_credential_option_autoload_value($autoload, $option) {
	1751	+ if (in_array($option, array('mxchat_prompts_options', 'mxchat_pinecone_addon_options'), true)) {
	1752	+ return false;
	1753	+ }
	1754	+ return $autoload;
	1755	+}
	1756	+
	1757	+/**
	1758	+ * One-time upgrade migration: flip the autoload flag on credential option
	1759	+ * rows that existing installs are already carrying autoloaded. Includes
	1760	+ * mxchat_adv_api_token (Advanced Content bearer token) — harmless no-op
	1761	+ * when that add-on is not installed, since missing rows simply don't match.
	1762	+ */
	1763	+function mxchat_fix_credential_option_autoload() {
	1764	+ $keys = array('mxchat_prompts_options', 'mxchat_pinecone_addon_options', 'mxchat_adv_api_token');
	1765	+ if (function_exists('wp_set_option_autoload_values')) {
	1766	+ wp_set_option_autoload_values(array_fill_keys($keys, false));
	1767	+ return;
	1768	+ }
	1769	+ // Pre-WP-6.4 fallback: direct flip + cache invalidation.
	1770	+ global $wpdb;
	1771	+ $placeholders = implode(',', array_fill(0, count($keys), '%s'));
	1772	+ $wpdb->query($wpdb->prepare("UPDATE {$wpdb->options} SET autoload = 'no' WHERE option_name IN ($placeholders)", $keys));
	1773	+ wp_cache_delete('alloptions', 'options');
	1774	+ foreach ($keys as $key) {
	1775	+ wp_cache_delete($key, 'options');
	1776	+ }
	1777	+}
	1778	+
	1779	+/**
	1780	+ * One-time carry of the import modal's remembered ACF→PDF checkbox state
	1781	+ * (mxchat_options['acf_pdf_extract_default'], written per-import until 3.2.16)
	1782	+ * into the new install-level option mxchat_acf_pdf_extraction (plan 11720c).
	1783	+ * Fresh installs and installs that never touched the checkbox default OFF,
	1784	+ * matching the setting's own "recommended only if…" guidance.
	1785	+ */
	1786	+function mxchat_migrate_acf_pdf_extraction_option() {
	1787	+ if (get_option('mxchat_acf_pdf_extraction', null) !== null) {
	1788	+ return; // already set — never overwrite an owner's choice
	1789	+ }
	1790	+ $mxchat_options = get_option('mxchat_options', array());
	1791	+ if (is_array($mxchat_options) && array_key_exists('acf_pdf_extract_default', $mxchat_options)) {
	1792	+ update_option('mxchat_acf_pdf_extraction', !empty($mxchat_options['acf_pdf_extract_default']) ? '1' : '0', false);
	1793	+ unset($mxchat_options['acf_pdf_extract_default']);
	1794	+ update_option('mxchat_options', $mxchat_options);
	1795	+ }
	1796	+}
	1797	+
	1798	+/**
	1799	+ * One-time migration of mxchat_acf_excluded_fields from field NAMES to field
	1800	+ * KEYS (plan 30e81f). Names are not unique across ACF groups, so two fields
	1801	+ * named the same in different groups shared one toggle, one saved state, and
	1802	+ * one exclusion — and the save-on-exit beacon could revert a save through the
	1803	+ * twin. Keys are unique; everything now runs on them.
	1804	+ *
	1805	+ * MIGRATION DIRECTION IS DELIBERATE: one stored name can match several keys —
	1806	+ * exclude EVERY one of them. The UI describes these as "sensitive or
	1807	+ * irrelevant fields"; an under-migration would silently start feeding a
	1808	+ * previously-excluded sensitive field into embeddings sent to a third-party
	1809	+ * provider. Over-excluding is visible in the UI and costs some retrieval
	1810	+ * quality; under-excluding is a silent privacy regression.
	1811	+ *
	1812	+ * Self-arming on acf/init (NOT the version-gated upgrade block): resolving
	1813	+ * names needs ACF fully booted with local JSON/PHP groups registered, and if
	1814	+ * ACF is deactivated at upgrade time the migration simply waits for the next
	1815	+ * load with ACF active. Until it runs, stored names keep working — every
	1816	+ * exclusion read site honors legacy name entries alongside keys. A name that
	1817	+ * matches no current key is KEPT (its group may be temporarily inactive), and
	1818	+ * the per-field include path lazily converts it if it ever resolves again.
	1819	+ */
	1820	+function mxchat_migrate_acf_exclusions_to_keys() {
	1821	+ if (get_option('mxchat_acf_exclusions_migrated', '') === '1') {
	1822	+ return;
	1823	+ }
	1824	+ $stored = get_option('mxchat_acf_excluded_fields', array());
	1825	+ if (!is_array($stored) || empty($stored)) {
	1826	+ update_option('mxchat_acf_exclusions_migrated', '1', false);
	1827	+ return;
	1828	+ }
	1829	+ if (!function_exists('acf_get_field_groups') || !function_exists('acf_get_fields')) {
	1830	+ return; // acf/init fired without the API? Bail; retry next load.
	1831	+ }
	1832	+
	1833	+ // Map every current top-level field: name => [keys], and the set of keys.
	1834	+ $name_to_keys = array();
	1835	+ $current_keys = array();
	1836	+ foreach (acf_get_field_groups() as $group) {
	1837	+ $group_fields = acf_get_fields($group['key']);
	1838	+ if (empty($group_fields)) {
	1839	+ continue;
	1840	+ }
	1841	+ foreach ($group_fields as $field) {
	1842	+ if (empty($field['key']) || !isset($field['name'])) {
	1843	+ continue;
	1844	+ }
	1845	+ $current_keys[$field['key']] = true;
	1846	+ $name_to_keys[$field['name']][] = $field['key'];
	1847	+ }
	1848	+ }
	1849	+
	1850	+ $migrated = array();
	1851	+ $converted = 0;
	1852	+ foreach ($stored as $entry) {
	1853	+ if (!is_string($entry) || $entry === '') {
	1854	+ continue;
	1855	+ }
	1856	+ if (isset($current_keys[$entry])) {
	1857	+ $migrated[] = $entry; // already a live key
	1858	+ } elseif (isset($name_to_keys[$entry])) {
	1859	+ foreach ($name_to_keys[$entry] as $key) {
	1860	+ $migrated[] = $key; // every key wearing this name — fail toward more exclusion
	1861	+ }
	1862	+ $converted++;
	1863	+ } else {
	1864	+ $migrated[] = $entry; // unresolved — keep; still honored by name everywhere
	1865	+ }
	1866	+ }
	1867	+ $migrated = array_values(array_unique($migrated));
	1868	+
	1869	+ update_option('mxchat_acf_excluded_fields', $migrated);
	1870	+ update_option('mxchat_acf_exclusions_migrated', '1', false);
	1871	+ if ($converted > 0) {
	1872	+ update_option('mxchat_acf_exclusions_migrated_notice', '1', false);
	1873	+ }
	1874	+}
	1875	+add_action('acf/init', 'mxchat_migrate_acf_exclusions_to_keys', 20);
	1876	+
	1877	+/**
	1878	+ * One-time notice after the ACF exclusion migration actually converted
	1879	+ * name entries — the settings are worth a review, especially where one name
	1880	+ * fanned out to several fields (every match is now excluded, on purpose).
	1881	+ */
	1882	+function mxchat_show_acf_exclusions_migrated_notice() {
	1883	+ if (!current_user_can('manage_options')) {
	1884	+ return;
	1885	+ }
	1886	+ if (get_option('mxchat_acf_exclusions_migrated_notice', '') !== '1') {
	1887	+ return;
	1888	+ }
	1889	+ ?>
	1890	+ <div class="notice notice-info is-dismissible">
	1891	+ <p>
	1892	+ <strong><?php esc_html_e('MxChat: ACF field exclusions updated', 'mxchat'); ?></strong><br>
	1893	+ <?php esc_html_e('Your ACF field exclusion settings were migrated to identify fields precisely, so same-named fields in different groups no longer share one toggle. Where a saved exclusion matched several fields, all of them are now excluded — please review the toggles under MxChat → Knowledge → ACF Field Settings.', 'mxchat'); ?>
	1894	+ </p>
	1895	+ </div>
	1896	+ <?php
	1897	+ delete_option('mxchat_acf_exclusions_migrated_notice');
	1898	+}
	1899	+add_action('admin_notices', 'mxchat_show_acf_exclusions_migrated_notice');
	1900	+
	1901	+/**
1295	1902	* Ensure tables exist on every admin load for fresh installations
1296	1903	* This is a safety net for cases where activation hook doesn't fire
1297	1904	*/
1298	1905	function mxchat_ensure_tables_exist() {
		@@ -1312,12 +1919,16 @@
1312	1919
1313	1920	$table_name = $wpdb->prefix . 'mxchat_chat_transcripts';
1314	1921	$queue_table = $wpdb->prefix . 'mxchat_processing_queue';
1315	1922
	1923	+ $sessions_table = $wpdb->prefix . 'mxchat_sessions';
	1924	+
1316	1925	$chat_exists = $wpdb->get_var("SHOW TABLES LIKE '$table_name'") === $table_name;
1317	1926	$queue_exists = $wpdb->get_var("SHOW TABLES LIKE '$queue_table'") === $queue_table;
1318		-
1319		- if (!$chat_exists || !$queue_exists) {
	1927	+ $sessions_exists = get_option('mxchat_session_store_ready') !== false
	1928	+ || $wpdb->get_var("SHOW TABLES LIKE '$sessions_table'") === $sessions_table;
	1929	+
	1930	+ if (!$chat_exists || !$queue_exists || !$sessions_exists) {
1320	1931	//error_log("MxChat: Tables missing on admin load, running activation");
1321	1932	mxchat_activate();
1322	1933	}
1323	1934	}
		@@ -1322,49 +1933,116 @@
1322	1933	}
1323	1934	}
1324	1935
1325	1936	/**
1326		- * Clean up orphaned chat history options from the wp_options table
1327		- * @return int Number of options deleted
	1937	+ * One-shot cleanup of legacy mxchat_history_<sid> option rows (plan 839c4c).
	1938	+ *
	1939	+ * 3.2.19 deduplicated per-session chat history into the transcripts table
	1940	+ * (which already held a superset of every option copy measured), so nothing
	1941	+ * writes these options any more — but an upgraded install still carries one
	1942	+ * per session, at up to 64 KB a row (462 rows measured on one production
	1943	+ * install). This drain replaces the old mxchat_cleanup_orphaned_chat_history()
	1944	+ * reconciliation sweep, which existed only because there were two copies to
	1945	+ * reconcile.
	1946	+ *
	1947	+ * b64b77 pattern throughout: an option_id bookmark that only moves forward
	1948	+ * (a crash mid-batch re-processes at most one batch), delete_option() per row
	1949	+ * so the object + notoptions caches stay coherent, batches drained off
	1950	+ * non-AJAX admin_init plus the session-store maintenance cron. Once the
	1951	+ * backlog is gone the state marks done and every later call is one cached
	1952	+ * option read.
1328	1953	*/
1329		-function mxchat_cleanup_orphaned_chat_history() {
	1954	+function mxchat_history_backlog_state() {
	1955	+ // The state option name MUST NOT start with 'mxchat_history_' — the drain
	1956	+ // deletes everything matching that prefix, and a state option inside the
	1957	+ // pattern gets eaten by its own drain (caught by the 839c4c rig: batches
	1958	+ // ran 2,2,2,1 instead of 2,2,1 because the bookmark row was being deleted
	1959	+ // and re-created every pass).
	1960	+ $state = get_option('mxchat_legacy_history_cleanup', array());
	1961	+ if (!is_array($state)) {
	1962	+ $state = array();
	1963	+ }
	1964	+
	1965	+ return wp_parse_args($state, array(
	1966	+ 'done' => false,
	1967	+ 'last_option_id' => 0,
	1968	+ 'deleted' => 0,
	1969	+ ));
	1970	+}
	1971	+
	1972	+/**
	1973	+ * Delete one batch of legacy history options.
	1974	+ *
	1975	+ * @param int $batch Rows per pass — capped small; these can be 64 KB rows.
	1976	+ * @return int Option rows deleted in this pass.
	1977	+ */
	1978	+function mxchat_history_backlog_batch($batch = 200) {
1330	1979	global $wpdb;
1331		- $count = 0;
1332	1980
1333		- // Get all option keys that match our pattern
1334		- $history_options = $wpdb->get_results(
1335		- "SELECT option_name FROM {$wpdb->options}
1336		- WHERE option_name LIKE 'mxchat_history_%'"
	1981	+ $state = mxchat_history_backlog_state();
	1982	+ if (!empty($state['done'])) {
	1983	+ return 0;
	1984	+ }
	1985	+
	1986	+ $batch = max(1, (int) $batch);
	1987	+
	1988	+ $rows = $wpdb->get_results(
	1989	+ $wpdb->prepare(
	1990	+ "SELECT option_id, option_name FROM {$wpdb->options}
	1991	+ WHERE option_id > %d AND option_name LIKE %s
	1992	+ ORDER BY option_id ASC LIMIT %d",
	1993	+ (int) $state['last_option_id'],
	1994	+ $wpdb->esc_like('mxchat_history_') . '%',
	1995	+ $batch
	1996	+ ),
	1997	+ ARRAY_A
1337	1998	);
1338	1999
1339		- if (!empty($history_options)) {
1340		- foreach ($history_options as $option) {
1341		- // Extract the session ID from the option name
1342		- $session_id = str_replace('mxchat_history_', '', $option->option_name);
	2000	+ if (empty($rows)) {
	2001	+ $state['done'] = true;
	2002	+ update_option('mxchat_legacy_history_cleanup', $state, 'no');
	2003	+ return 0;
	2004	+ }
1343	2005
1344		- // Check if this session still exists in the custom table
1345		- $table_name = $wpdb->prefix . 'mxchat_chat_transcripts';
1346		- $exists = $wpdb->get_var(
1347		- $wpdb->prepare(
1348		- "SELECT COUNT(*) FROM {$table_name} WHERE session_id = %s",
1349		- $session_id
1350		- )
1351		- );
	2006	+ foreach ($rows as $row) {
	2007	+ $state['last_option_id'] = max((int) $state['last_option_id'], (int) $row['option_id']);
	2008	+ delete_option($row['option_name']);
	2009	+ $state['deleted'] = (int) $state['deleted'] + 1;
	2010	+ }
1352	2011
1353		- // If session doesn't exist in the main table, delete the option
1354		- if ($exists == 0) {
1355		- delete_option($option->option_name);
1356		- // Also delete related metadata
1357		- delete_option("mxchat_email_{$session_id}");
1358		- delete_option("mxchat_name_{$session_id}");
1359		- delete_option("mxchat_agent_name_{$session_id}");
1360		- $count++;
1361		- }
	2012	+ if (count($rows) < $batch) {
	2013	+ $state['done'] = true;
	2014	+ }
	2015	+
	2016	+ update_option('mxchat_legacy_history_cleanup', $state, 'no');
	2017	+
	2018	+ return count($rows);
	2019	+}
	2020	+
	2021	+/** One batch per admin page load until drained. */
	2022	+function mxchat_history_backlog_drain() {
	2023	+ mxchat_history_backlog_batch();
	2024	+}
	2025	+
	2026	+/** Cron leg: drain faster, same cap per batch. */
	2027	+function mxchat_history_backlog_drain_cron() {
	2028	+ for ($i = 0; $i < 10; $i++) {
	2029	+ if (mxchat_history_backlog_batch() === 0) {
	2030	+ break;
1362	2031	}
1363	2032	}
	2033	+}
1364	2034
1365		- return $count;
	2035	+// wp_doing_ajax() guard is load-bearing, not defensive (b64b77's shipped-and-
	2036	+// caught defect): admin-ajax.php fires admin_init too, and the chat widget's
	2037	+// message endpoint is an admin-ajax action — without the guard an anonymous
	2038	+// visitor would pay for a delete batch inside their own chat request.
	2039	+if (!wp_doing_ajax()) {
	2040	+ add_action('admin_init', 'mxchat_history_backlog_drain', 21);
1366	2041	}
	2042	+// Belt for installs whose admin is rarely visited: ride the session store's
	2043	+// existing daily maintenance event rather than scheduling another.
	2044	+add_action('mxchat_session_store_maintenance', 'mxchat_history_backlog_drain_cron');
1367	2045
1368	2046	function mxchat_migrate_live_agent_status() {
1369	2047	$options = get_option('mxchat_options', []);
1370	2048
		@@ -1467,8 +2145,9 @@
1467	2145	add_action('init', 'mxchat_check_fallback_rate_limits', 5);
1468	2146
1469	2147	// Add migration notice hook
1470	2148	add_action('admin_notices', 'mxchat_show_migration_notice');
	2149	+ add_action('admin_notices', 'mxchat_show_model_access_notice');
1471	2150
1472	2151	// Initialize classes with error handling
1473	2152	try {
1474	2153	// Initialize admin classes
		@@ -1493,8 +2172,15 @@
1493	2172	if (class_exists('MxChat_Content_Generator')) {
1494	2173	new MxChat_Content_Generator();
1495	2174	}
1496	2175
	2176	+ // Initialize cache purge globally — settings writes can happen on any
	2177	+ // request type (admin screens, admin-ajax autosave, wp-cli), and the
	2178	+ // deferred-purge cron event fires on front-end requests.
	2179	+ if (class_exists('MxChat_Cache_Purge')) {
	2180	+ MxChat_Cache_Purge::init();
	2181	+ }
	2182	+
1497	2183	// Initialize REST API globally — endpoints must be registered on
1498	2184	// every request (admin and frontend) so they're reachable via /wp-json/.
1499	2185	// Endpoints are auth-gated and locked until the site owner generates
1500	2186	// a token in MxChat → API Access.
		@@ -1619,9 +2305,9 @@
1619	2305	*/
1620	2306	function mxchat_save_session_rating() {
1621	2307	global $wpdb;
1622	2308
1623		- $session_id = isset($_POST['session_id']) ? sanitize_text_field(wp_unslash($_POST['session_id'])) : '';
	2309	+ $session_id = isset($_POST['session_id']) ? MxChat_Utils::sanitize_session_id(wp_unslash($_POST['session_id'])) : '';
1624	2310	$bot_id = isset($_POST['bot_id']) ? sanitize_text_field(wp_unslash($_POST['bot_id'])) : 'default';
1625	2311	$rating_raw = isset($_POST['rating']) ? (int) $_POST['rating'] : 0;
1626	2312	$feedback = isset($_POST['feedback']) ? sanitize_textarea_field(wp_unslash($_POST['feedback'])) : '';
1627	2313