diff --git a/app_config.php b/app_config.php
index f79747f..40e784c 100644
--- a/app_config.php
+++ b/app_config.php
@@ -153,6 +153,12 @@
 $apps[$x]['db'][$y]['fields'][$z]['name'] = "direction";
 $apps[$x]['db'][$y]['fields'][$z]['type'] = "text";
 $apps[$x]['db'][$y]['fields'][$z]['description']['en-us'] = "";
+$z++;
+$apps[$x]['db'][$y]['fields'][$z]['name'] = "delivered";
+$apps[$x]['db'][$y]['fields'][$z]['type']['pgsql'] = "boolean";
+$apps[$x]['db'][$y]['fields'][$z]['type']['sqlite'] = "boolean";
+$apps[$x]['db'][$y]['fields'][$z]['type']['mysql'] = "boolean";
+$apps[$x]['db'][$y]['fields'][$z]['description']['en-us'] = "carrier delivery status: true=delivered, false=failed, NULL=pending/unknown";
 
 
 $y++;
@@ -251,3 +257,88 @@
 $apps[$x]['db'][$y]['fields'][$z]['type']['sqlite'] = 'date';
 $apps[$x]['db'][$y]['fields'][$z]['type']['mysql'] = 'date';
 $apps[$x]['db'][$y]['fields'][$z]['description']['en-us'] = "";
+$z++;
+$apps[$x]['db'][$y]['fields'][$z]['name'] = "thread_uuid";
+$apps[$x]['db'][$y]['fields'][$z]['type']['pgsql'] = "uuid";
+$apps[$x]['db'][$y]['fields'][$z]['type']['sqlite'] = "text";
+$apps[$x]['db'][$y]['fields'][$z]['type']['mysql'] = "char(36)";
+$apps[$x]['db'][$y]['fields'][$z]['description']['en-us'] = "stable per-thread identifier; DEFAULT uuid_generate_v4() + UNIQUE applied via raw PHP below (not DSL-expressible)";
+
+//webtexting_threads.thread_uuid + webtexting_threads_last_seen + webtexting_message_templates
+//schema reconciliation. dsl above declares the thread_uuid column but can't express
+//DEFAULT uuid_generate_v4() or UNIQUE constraints; raw migrations encoded here.
+//pgsql-specific. uuid_generate_v4() requires uuid-ossp extension.
+
+	$default_applied = $database->select(
+		"SELECT 1 FROM information_schema.columns
+		 WHERE table_name = 'webtexting_threads'
+		   AND column_name = 'thread_uuid'
+		   AND column_default LIKE '%uuid_generate_v4%'",
+		[], 'column'
+	);
+	$unique_applied = $database->select(
+		"SELECT 1 FROM pg_constraint WHERE conname = 'webtexting_threads_thread_uuid_key'",
+		[], 'column'
+	);
+
+	if (!$default_applied || !$unique_applied) {
+		echo "webtexting: applying webtexting_threads.thread_uuid schema migration (one-time post-install)...<br/>";
+		try {
+			$database->execute("BEGIN");
+			$database->execute("CREATE EXTENSION IF NOT EXISTS \"uuid-ossp\"");
+
+			// DSL's column-create runs AFTER this raw PHP block, so add the column
+			// defensively here. ADD COLUMN IF NOT EXISTS is the idempotent form.
+			$database->execute("ALTER TABLE webtexting_threads ADD COLUMN IF NOT EXISTS thread_uuid uuid");
+
+			if (!$default_applied) {
+				$database->execute("UPDATE webtexting_threads SET thread_uuid = uuid_generate_v4() WHERE thread_uuid IS NULL");
+				$database->execute("ALTER TABLE webtexting_threads ALTER COLUMN thread_uuid SET DEFAULT uuid_generate_v4()");
+			}
+
+			if (!$unique_applied) {
+				$database->execute("ALTER TABLE webtexting_threads ADD CONSTRAINT webtexting_threads_thread_uuid_key UNIQUE (thread_uuid)");
+			}
+
+			$database->execute("COMMIT");
+			echo "webtexting: thread_uuid schema migration applied.<br/>";
+		} catch (Throwable $e) {
+			$database->execute("ROLLBACK");
+			echo "webtexting: thread_uuid schema migration FAILED: " . htmlspecialchars($e->getMessage()) . "<br/>";
+			echo "webtexting: apply manually: <code>BEGIN; CREATE EXTENSION IF NOT EXISTS \"uuid-ossp\"; ALTER TABLE webtexting_threads ADD COLUMN IF NOT EXISTS thread_uuid uuid; UPDATE webtexting_threads SET thread_uuid = uuid_generate_v4() WHERE thread_uuid IS NULL; ALTER TABLE webtexting_threads ALTER COLUMN thread_uuid SET DEFAULT uuid_generate_v4(); ALTER TABLE webtexting_threads ADD CONSTRAINT webtexting_threads_thread_uuid_key UNIQUE (thread_uuid); COMMIT;</code><br/>";
+		}
+	}
+
+//webtexting_threads_last_seen — read-state tracking table for the conversation viewer.
+//pgsql-specific (uuid, timestamptz). idempotent via IF NOT EXISTS.
+	$database->execute("CREATE TABLE IF NOT EXISTS webtexting_threads_last_seen (
+		thread_uuid    uuid NOT NULL,
+		extension_uuid uuid NOT NULL,
+		domain_uuid    uuid NOT NULL,
+		timestamp      timestamptz,
+		last_seen_uuid uuid NOT NULL DEFAULT uuid_generate_v4(),
+		CONSTRAINT webtexting_threads_last_seen_pkey PRIMARY KEY (last_seen_uuid)
+	)");
+
+//webtexting_message_templates — canned-reply / template storage.
+//pgsql-specific (uuid, timestamptz). idempotent via IF NOT EXISTS.
+//note: pkey constraint name has misspelled plural ("messages_templates") — replicated
+//verbatim to match production schema on sfo; cosmetic typo, harmless.
+	$database->execute("CREATE TABLE IF NOT EXISTS webtexting_message_templates (
+		email_template_uuid  uuid NOT NULL DEFAULT uuid_generate_v4(),
+		domain_uuid          uuid,
+		template_language    text,
+		template_category    text,
+		template_subcategory text,
+		template_subject     text,
+		template_body        text,
+		template_type        text,
+		template_enabled     text,
+		template_description text,
+		insert_date          timestamptz,
+		insert_user          uuid,
+		update_date          timestamptz,
+		update_user          uuid,
+		template_name        text,
+		CONSTRAINT webtexting_messages_templates_pkey PRIMARY KEY (email_template_uuid)
+	)");