chore: do not set a default for longtext db fields

Signed-off-by: Anupam Kumar <kyteinsky@gmail.com>

Author: kyteinsky

lib/Controller/ChattyLLMController.php

@@ -140,6 +140,8 @@ public function newSession(int $timestamp, ?string $title = null): JSONResponse
 			$session->setUserId($this->userId);
 			$session->setTitle($title);
 			$session->setTimestamp($timestamp);
+			$session->setAgencyConversationToken(null);
+			$session->setAgencyPendingActions(null);
 			$this->sessionMapper->insert($session);
 
 			$systemMsg = new Message();

lib/Migration/Version020200Date20241218145833.php

@@ -32,14 +32,12 @@ public function changeSchema(IOutput $output, Closure $schemaClosure, array $opt
 			if (!$table->hasColumn('conversation_token')) {
 				$table->addColumn('agency_conversation_token', Types::TEXT, [
 					'notnull' => false,
-					'default' => null,
 				]);
 				$schemaChanged = true;
 			}
 			if (!$table->hasColumn('agency_pending_actions')) {
 				$table->addColumn('agency_pending_actions', Types::TEXT, [
 					'notnull' => false,
-					'default' => null,
 				]);
 				$schemaChanged = true;
 			}

lib/Migration/Version020500Date20250425125359.php

@@ -32,7 +32,6 @@ public function changeSchema(IOutput $output, Closure $schemaClosure, array $opt
 			if (!$table->hasColumn('sources')) {
 				$table->addColumn('sources', Types::TEXT, [
 					'notnull' => true,
-					'default' => '[]',
 				]);
 				$schemaChanged = true;
 			}

lib/Migration/Version020600Date20250704145036.php

@@ -32,7 +32,6 @@ public function changeSchema(IOutput $output, Closure $schemaClosure, array $opt
 			if (!$table->hasColumn('attachments')) {
 				$table->addColumn('attachments', Types::TEXT, [
 					'notnull' => true,
-					'default' => '[]',
 				]);
 				$schemaChanged = true;
 			}