Update to ObjectBox 5.1

Author: greenrobot

docs/README.mdx

@@ -68,6 +68,26 @@ Otherwise, feel free to open an issue on [GitHub ](https://github.com/objectbox/
 
 <div align="left"><img src="https://img.shields.io/github/v/release/objectbox/objectbox-c?style=for-the-badge" alt=""/></div>
 
+### 5.1.0 (2026-01-19)
+
+* Fix for deleting transactions in non-owner threads with open relation cursors
+* Admin: the Schema view now shows if external name of types and properties if configured
+* Admin: the Schema view now shows the type as text (e.g. "String") instead of the internal type ID
+* Internal updates
+
+#### Sync
+
+* New Sync protocol V8: using new clients also require a server update
+* Remove-operations with object content for Sync filters (optional setting; sync flag)
+* Introduce options based Sync client creation (new C API)
+* Add DebugLogTxLogs sync flag to log TX log processing on the client side
+* Add SkipInvalidTxOps sync flag to skip invalid operations in a TX log on the client side;
+errors are logged and the TX is only partially applied.
+* Remove superfluous sync listener triggers when sync filters "report updates" (SKIP_TX)
+* Sync clients compress earlier: reduces disk storage for outgoing data
+* Reworked SSL certificates for Apple platforms
+* Removed support for older Sync protocol versions before 2024-09; protocol V5+ is now required
+
 ### 5.0.0 (2025-11-27)
 
 #### User-Specific Data Sync

docs/installation.mdx

@@ -50,7 +50,7 @@ include(FetchContent)
 FetchContent_Declare(
     objectbox
     GIT_REPOSITORY https://github.com/objectbox/objectbox-c.git
-    GIT_TAG        v5.0.0
+    GIT_TAG        v5.1.0
 )
 
 FetchContent_MakeAvailable(objectbox)
@@ -81,7 +81,7 @@ include(FetchContent)
 FetchContent_Declare(
     objectbox
     GIT_REPOSITORY https://github.com/objectbox/objectbox-c.git
-    GIT_TAG        v5.0.0
+    GIT_TAG        v5.1.0
 )
 
 FetchContent_GetProperties(objectbox)
@@ -123,7 +123,7 @@ Using the download.sh script (on Windows, use something like Git Bash to run it)
 
 Details on the download.sh script:
 
-* Creates a "download" directory and a version dependent sub directory named like "libobjectbox-5.0.0-some-hex-hash".
+* Creates a "download" directory and a version dependent sub directory named like "libobjectbox-5.1.0-some-hex-hash".
 * Inside the version dependent sub directory, you will find the directories "include" and "lib"/
 * The "lib" directory contains the binary library.
 * Gives you an option to install the library to `/usr/lib` (linux) or `/usr/local/lib` (macOS).
@@ -196,7 +196,7 @@ Using the ObjectBox Generator with CMake  is straightforward (after the installa
 
 ```cmake
 # Downloads automatically if not found on system per default)
-find_package(ObjectBoxGenerator 5.0.0 REQUIRED)
+find_package(ObjectBoxGenerator 5.1.0 REQUIRED)
 
 # generate C++ files from tasklist.fbs and compile/link with target
 add_obx_schema(
@@ -279,4 +279,4 @@ target_link_libraries(c99app objectbox flatccrt)
 ```
 
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