diff --git a/changelog.md b/changelog.md
index 2f335dc..cfdbc87 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 2025-11-28 - 7.0.14 - fix(classes.collection)
+Centralize TC39 decorator metadata initialization and use context.metadata in class decorators
+
+- Add initializeDecoratorMetadata helper to initialize prototype and constructor properties from TC39 decorator metadata
+- Refactor Collection and managed decorators to call initializeDecoratorMetadata with context.metadata
+- Remove direct reliance on constructor[Symbol.metadata] in class decorators to avoid read-only assignment issues
+- Ensure consistent initialization of saveableProperties, globalSaveableProperties, uniqueIndexes, regularIndexes, searchableFields and _svDbOptions
+
 ## 2025-11-28 - 7.0.13 - fix(classes.doc)
 Remove noisy debug logging from decorators and serialization logic
 
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index d77260d..74d50cd 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartdata',
-  version: '7.0.13',
+  version: '7.0.14',
   description: 'An advanced library for NoSQL data organization and manipulation using TypeScript with support for MongoDB, data validation, collections, and custom data types.'
 }
diff --git a/ts/classes.collection.ts b/ts/classes.collection.ts
index edb20d5..02c7968 100644
--- a/ts/classes.collection.ts
+++ b/ts/classes.collection.ts
@@ -21,6 +21,42 @@ export type TDelayed<TDelayedArg> = () => TDelayedArg;
 
 const collectionFactory = new CollectionFactory();
 
+/**
+ * Initialize prototype and constructor properties from TC39 decorator metadata.
+ * Shared by both Collection and managed decorators.
+ */
+function initializeDecoratorMetadata(
+  constructor: { new (...args: any[]): any; prototype: any },
+  metadata: any
+): void {
+  if (!metadata) return;
+
+  const proto = constructor.prototype;
+  const ctor = constructor as any;
+
+  // Prototype properties (instance-level)
+  if (metadata.globalSaveableProperties && !proto.globalSaveableProperties) {
+    proto.globalSaveableProperties = [...metadata.globalSaveableProperties];
+  }
+  if (metadata.saveableProperties && !proto.saveableProperties) {
+    proto.saveableProperties = [...metadata.saveableProperties];
+  }
+  if (metadata.uniqueIndexes && !proto.uniqueIndexes) {
+    proto.uniqueIndexes = [...metadata.uniqueIndexes];
+  }
+  if (metadata.regularIndexes && !proto.regularIndexes) {
+    proto.regularIndexes = [...metadata.regularIndexes];
+  }
+
+  // Constructor properties (static-level)
+  if (metadata.searchableFields && !Array.isArray(ctor.searchableFields)) {
+    ctor.searchableFields = [...metadata.searchableFields];
+  }
+  if (metadata._svDbOptions && !ctor._svDbOptions) {
+    ctor._svDbOptions = { ...metadata._svDbOptions };
+  }
+}
+
 /**
  * This is a decorator that will tell the decorated class what dbTable to use
  * @param dbArg
@@ -62,38 +98,7 @@ export function Collection(dbArg: SmartdataDb | TDelayed<SmartdataDb>) {
       configurable: true
     });
 
-    // Initialize prototype properties from context.metadata (TC39 decorator metadata)
-    // This ensures prototype properties are available before any instance is created
-    const metadata = context.metadata as any;
-    if (metadata) {
-      const proto = constructor.prototype;
-
-      if (metadata.globalSaveableProperties && !proto.globalSaveableProperties) {
-        proto.globalSaveableProperties = [...metadata.globalSaveableProperties];
-      }
-
-      if (metadata.saveableProperties && !proto.saveableProperties) {
-        proto.saveableProperties = [...metadata.saveableProperties];
-      }
-
-      if (metadata.uniqueIndexes && !proto.uniqueIndexes) {
-        proto.uniqueIndexes = [...metadata.uniqueIndexes];
-      }
-
-      if (metadata.regularIndexes && !proto.regularIndexes) {
-        proto.regularIndexes = [...metadata.regularIndexes];
-      }
-
-      if (metadata.searchableFields && !Array.isArray((constructor as any).searchableFields)) {
-        (constructor as any).searchableFields = [...metadata.searchableFields];
-      }
-
-      if (metadata._svDbOptions && !(constructor as any)._svDbOptions) {
-        (constructor as any)._svDbOptions = { ...metadata._svDbOptions };
-      }
-    }
-
-    // Return the ORIGINAL constructor (no class replacement)
+    initializeDecoratorMetadata(constructor, context.metadata);
     return constructor as any;
   };
 }
@@ -118,106 +123,44 @@ export function managed<TManager extends IManager>(managerArg?: TManager | TDela
     }
 
     const constructor = value as { new (...args: any[]): any } & { className?: string };
-
-    // Add static className property directly on the constructor
     (constructor as any).className = constructor.name;
 
-    // Define collection getter (static)
+    // Resolution helpers (capture managerArg via closure)
+    const getManager = (defaultManagerFn: () => TManager): TManager => {
+      if (!managerArg) return defaultManagerFn();
+      if (managerArg['db']) return managerArg as TManager;
+      return (managerArg as TDelayed<TManager>)();
+    };
+
+    const getDb = (defaultManagerFn: () => TManager): SmartdataDb => {
+      return getManager(defaultManagerFn).db;
+    };
+
+    // Static getters
     Object.defineProperty(constructor, 'collection', {
-      get: function(this: any) {
-        let dbArg: SmartdataDb;
-        if (!managerArg) {
-          dbArg = this.prototype.defaultManager.db;
-        } else if (managerArg['db']) {
-          dbArg = (managerArg as TManager).db;
-        } else {
-          dbArg = (managerArg as TDelayed<TManager>)().db;
-        }
-        return collectionFactory.getCollection(constructor.name, dbArg);
-      },
+      get(this: any) { return collectionFactory.getCollection(constructor.name, getDb(() => this.prototype.defaultManager)); },
       enumerable: false,
       configurable: true
     });
-
-    // Define collection getter (instance)
-    Object.defineProperty(constructor.prototype, 'collection', {
-      get: function(this: any) {
-        let dbArg: SmartdataDb;
-        if (!managerArg) {
-          dbArg = this.defaultManager.db;
-        } else if (managerArg['db']) {
-          dbArg = (managerArg as TManager).db;
-        } else {
-          dbArg = (managerArg as TDelayed<TManager>)().db;
-        }
-        return collectionFactory.getCollection(constructor.name, dbArg);
-      },
-      enumerable: false,
-      configurable: true
-    });
-
-    // Define manager getter (static)
     Object.defineProperty(constructor, 'manager', {
-      get: function(this: any) {
-        if (!managerArg) {
-          return this.prototype.defaultManager;
-        } else if (managerArg['db']) {
-          return managerArg as TManager;
-        } else {
-          return (managerArg as TDelayed<TManager>)();
-        }
-      },
+      get(this: any) { return getManager(() => this.prototype.defaultManager); },
       enumerable: false,
       configurable: true
     });
 
-    // Define manager getter (instance)
+    // Instance getters
+    Object.defineProperty(constructor.prototype, 'collection', {
+      get(this: any) { return collectionFactory.getCollection(constructor.name, getDb(() => this.defaultManager)); },
+      enumerable: false,
+      configurable: true
+    });
     Object.defineProperty(constructor.prototype, 'manager', {
-      get: function(this: any) {
-        if (!managerArg) {
-          return this.defaultManager;
-        } else if (managerArg['db']) {
-          return managerArg as TManager;
-        } else {
-          return (managerArg as TDelayed<TManager>)();
-        }
-      },
+      get(this: any) { return getManager(() => this.defaultManager); },
       enumerable: false,
       configurable: true
     });
 
-    // Initialize prototype properties from context.metadata (TC39 decorator metadata)
-    // This ensures prototype properties are available before any instance is created
-    const metadata = context.metadata as any;
-    if (metadata) {
-      const proto = constructor.prototype;
-
-      if (metadata.globalSaveableProperties && !proto.globalSaveableProperties) {
-        proto.globalSaveableProperties = [...metadata.globalSaveableProperties];
-      }
-
-      if (metadata.saveableProperties && !proto.saveableProperties) {
-        proto.saveableProperties = [...metadata.saveableProperties];
-      }
-
-      if (metadata.uniqueIndexes && !proto.uniqueIndexes) {
-        proto.uniqueIndexes = [...metadata.uniqueIndexes];
-      }
-
-      if (metadata.regularIndexes && !proto.regularIndexes) {
-        proto.regularIndexes = [...metadata.regularIndexes];
-      }
-
-      if (metadata.searchableFields && !Array.isArray((constructor as any).searchableFields)) {
-        (constructor as any).searchableFields = [...metadata.searchableFields];
-      }
-
-      if (metadata._svDbOptions && !(constructor as any)._svDbOptions) {
-        (constructor as any)._svDbOptions = { ...metadata._svDbOptions };
-      }
-    }
-
-    // Return the ORIGINAL constructor (no class replacement)
+    initializeDecoratorMetadata(constructor, context.metadata);
     return constructor as any;
   };
 }