Add JSON type support in object property handling

- Added `json` to the list of valid types for object properties.
- Implemented JSON decoding for column values when the type is `json`.

services/nginx/app/classes/object_property.php

@@ -51,7 +51,7 @@ class object_property
             throw new \InvalidArgumentException("Table or column cannot be empty");
         }
         // Check if the type is valid
-        if (!in_array($this->type, ['int', 'varchar', 'text', 'date', 'datetime', 'string', 'timestamp', 'boolean', 'bool', 'float'])) {
+        if (!in_array($this->type, ['int', 'varchar', 'text', 'date', 'datetime', 'string', 'timestamp', 'boolean', 'bool', 'float', 'json'])) {
             throw new \InvalidArgumentException("Invalid type: $this->type");
         }
         $sql = "SELECT $this->column FROM $this->table WHERE id = $this->id";
@@ -60,6 +60,11 @@ class object_property
         if (empty($row)) {
             throw new \RuntimeException("No record found for column '$this->column' in table '$this->table' with ID $this->id");
         }
+        // If the type is set to json, decode it.
+        $value = $row[$this->column];
+        if ($this->type === 'json' && $value !== null) {
+            return json_decode($value, true);
+        }
         return $row[$this->column];
     }