diff --git a/backend/src/api-keys/repositories/api-keys.repository.spec.ts b/backend/src/api-keys/repositories/api-keys.repository.spec.ts
index c4837e9..12872d4 100644
--- a/backend/src/api-keys/repositories/api-keys.repository.spec.ts
+++ b/backend/src/api-keys/repositories/api-keys.repository.spec.ts
@@ -20,10 +20,14 @@ describe("ApiKeysRepository", () => {
 	};
 
 	const wrapWithThen = (obj: any) => {
-		obj.then = function (onFulfilled: any) {
-			const result = this.execute();
-			return Promise.resolve(result).then(onFulfilled);
-		};
+		// biome-ignore lint/suspicious/noThenProperty: Necessary to mock Drizzle's awaitable query builder
+		Object.defineProperty(obj, "then", {
+			value: function (onFulfilled: any) {
+				const result = this.execute();
+				return Promise.resolve(result).then(onFulfilled);
+			},
+			configurable: true,
+		});
 		return obj;
 	};
 	wrapWithThen(mockDb);
diff --git a/backend/src/categories/repositories/categories.repository.spec.ts b/backend/src/categories/repositories/categories.repository.spec.ts
index a89b1b5..c211eab 100644
--- a/backend/src/categories/repositories/categories.repository.spec.ts
+++ b/backend/src/categories/repositories/categories.repository.spec.ts
@@ -21,10 +21,14 @@ describe("CategoriesRepository", () => {
 	};
 
 	const wrapWithThen = (obj: any) => {
-		obj.then = function (onFulfilled: any) {
-			const result = this.execute();
-			return Promise.resolve(result).then(onFulfilled);
-		};
+		// biome-ignore lint/suspicious/noThenProperty: Necessary to mock Drizzle's awaitable query builder
+		Object.defineProperty(obj, "then", {
+			value: function (onFulfilled: any) {
+				const result = this.execute();
+				return Promise.resolve(result).then(onFulfilled);
+			},
+			configurable: true,
+		});
 		return obj;
 	};
 	wrapWithThen(mockDb);
diff --git a/backend/src/favorites/repositories/favorites.repository.spec.ts b/backend/src/favorites/repositories/favorites.repository.spec.ts
index 3d051fa..4f27d1d 100644
--- a/backend/src/favorites/repositories/favorites.repository.spec.ts
+++ b/backend/src/favorites/repositories/favorites.repository.spec.ts
@@ -20,10 +20,14 @@ describe("FavoritesRepository", () => {
 	};
 
 	const wrapWithThen = (obj: any) => {
-		obj.then = function (onFulfilled: any) {
-			const result = this.execute();
-			return Promise.resolve(result).then(onFulfilled);
-		};
+		// biome-ignore lint/suspicious/noThenProperty: Necessary to mock Drizzle's awaitable query builder
+		Object.defineProperty(obj, "then", {
+			value: function (onFulfilled: any) {
+				const result = this.execute();
+				return Promise.resolve(result).then(onFulfilled);
+			},
+			configurable: true,
+		});
 		return obj;
 	};
 	wrapWithThen(mockDb);
diff --git a/backend/src/reports/repositories/reports.repository.spec.ts b/backend/src/reports/repositories/reports.repository.spec.ts
index f35e699..e31eae5 100644
--- a/backend/src/reports/repositories/reports.repository.spec.ts
+++ b/backend/src/reports/repositories/reports.repository.spec.ts
@@ -22,10 +22,14 @@ describe("ReportsRepository", () => {
 	};
 
 	const wrapWithThen = (obj: any) => {
-		obj.then = function (onFulfilled: any) {
-			const result = this.execute();
-			return Promise.resolve(result).then(onFulfilled);
-		};
+		// biome-ignore lint/suspicious/noThenProperty: Necessary to mock Drizzle's awaitable query builder
+		Object.defineProperty(obj, "then", {
+			value: function (onFulfilled: any) {
+				const result = this.execute();
+				return Promise.resolve(result).then(onFulfilled);
+			},
+			configurable: true,
+		});
 		return obj;
 	};
 	wrapWithThen(mockDb);