diff --git a/core/src/main/java/de/srsoftware/umbrella/core/model/Property.java b/core/src/main/java/de/srsoftware/umbrella/core/model/Property.java
index 284d326..87f83bd 100644
--- a/core/src/main/java/de/srsoftware/umbrella/core/model/Property.java
+++ b/core/src/main/java/de/srsoftware/umbrella/core/model/Property.java
@@ -1,7 +1,6 @@
 /* © SRSoftware 2025 */
 package de.srsoftware.umbrella.core.model;
 
-import static de.srsoftware.tools.Optionals.nullable;
 import static de.srsoftware.umbrella.core.Constants.*;
 
 import de.srsoftware.tools.Mappable;
@@ -45,4 +44,9 @@ public class Property implements Mappable {
 		if (unit  != null) map.put(UNIT,unit);
 		return map;
 	}
+
+	public Property value(Object newVal){
+		value = newVal;
+		return this;
+	}
 }
diff --git a/frontend/src/routes/stock/Index.svelte b/frontend/src/routes/stock/Index.svelte
index 3716eb9..37d1dfb 100644
--- a/frontend/src/routes/stock/Index.svelte
+++ b/frontend/src/routes/stock/Index.svelte
@@ -35,6 +35,7 @@
             var json = await res.json();
             var dict = {}
             for (var entry of json.sort((a,b) => b.id - a.id)) dict[entry.name+'.'+entry.unit] = entry;
+            properties = null;
             properties = Object.values(dict).sort((a,b) => a.name.localeCompare(b.name));
             yikes();
         } else error(res);
diff --git a/frontend/src/routes/stock/ItemProps.svelte b/frontend/src/routes/stock/ItemProps.svelte
index 9758e91..d95449f 100644
--- a/frontend/src/routes/stock/ItemProps.svelte
+++ b/frontend/src/routes/stock/ItemProps.svelte
@@ -14,6 +14,10 @@
         }
     });
 
+    function byName(a,b){
+        return a.name.localeCompare(b.name);
+    }
+
     async function onclick(){
         const url = api('stock/property');
         const data = {
@@ -29,6 +33,10 @@
             body:JSON.stringify(data)
         });
         if (res.ok){
+            const prop = await res.json();
+            const id = prop.id;
+            item.properties = item.properties.filter(p => p.id != id);
+            item.properties.push(prop);
             yikes();
         } else error(res);
     }
@@ -39,7 +47,7 @@
 
 <table>
     <tbody>
-        {#each item.properties as prop}
+        {#each item.properties.toSorted(byName) as prop}
         <tr>
             <td>
                 {prop.name}
diff --git a/markdown/src/main/java/de/srsoftware/umbrella/markdown/MarkdownApi.java b/markdown/src/main/java/de/srsoftware/umbrella/markdown/MarkdownApi.java
index 4e11a54..c71b9c3 100644
--- a/markdown/src/main/java/de/srsoftware/umbrella/markdown/MarkdownApi.java
+++ b/markdown/src/main/java/de/srsoftware/umbrella/markdown/MarkdownApi.java
@@ -6,15 +6,12 @@ import static de.srsoftware.umbrella.core.ModuleRegistry.userService;
 
 import com.sun.net.httpserver.HttpExchange;
 import de.srsoftware.tools.Path;
-import de.srsoftware.tools.SessionToken;
 import de.srsoftware.umbrella.core.BaseHandler;
 import de.srsoftware.umbrella.core.ModuleRegistry;
 import de.srsoftware.umbrella.core.Util;
 import de.srsoftware.umbrella.core.api.MarkdownService;
 import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
-import de.srsoftware.umbrella.core.model.Token;
 import java.io.IOException;
-import java.util.Optional;
 
 public class MarkdownApi extends BaseHandler implements MarkdownService {
 
diff --git a/stock/src/main/java/de/srsoftware/umbrella/stock/SqliteDb.java b/stock/src/main/java/de/srsoftware/umbrella/stock/SqliteDb.java
index b42d3e1..11466b5 100644
--- a/stock/src/main/java/de/srsoftware/umbrella/stock/SqliteDb.java
+++ b/stock/src/main/java/de/srsoftware/umbrella/stock/SqliteDb.java
@@ -51,17 +51,34 @@ public class SqliteDb extends BaseDb implements StockDb {
 	}
 
 	@Override
-	public void addProperty(long ownerId, long itemId, long existingPropId, Object value) {
+	public Property addProperty(long ownerId, long itemId, long existingPropId, Object value) {
 		try {
-			insertInto(TABLE_ITEM_PROPERTIES,OWNER,ITEM_ID,PROPERTY_ID,VALUE).values(ownerId,itemId,existingPropId,value).execute(db);
+			Property prop = null;
+			var rs = select(ALL).from(TABLE_PROPERTIES).where(ID,equal(existingPropId)).exec(db);
+			if (rs.next()) prop = Property.of(rs);
+			rs.close();
+			if (prop == null) throw databaseException("Failed to add new property to item {0}",itemId);
+			replaceInto(TABLE_ITEM_PROPERTIES,OWNER,ITEM_ID,PROPERTY_ID,VALUE).values(ownerId,itemId,existingPropId,value).execute(db);
+			return prop.value(value);
 		} catch (SQLException e) {
 			throw databaseException("Failed to add new property to item {0}",itemId);
 		}
 	}
 
 	@Override
-	public void addProperty(long ownerId, long itemId, String name, Object value, String unit) {
-		// TODO
+	public Property addNewProperty(long ownerId, long itemId, String name, Object value, String unit) {
+		try {
+			db.setAutoCommit(false);
+			var rs = insertInto(TABLE_PROPERTIES,NAME,TYPE,UNIT).values(name,0,unit).execute(db).getGeneratedKeys();
+			Long propertyId = null;
+			if (rs.next()) propertyId = rs.getLong(1);
+			rs.close();
+			if (propertyId == null || propertyId == 0) throw databaseException("Failed to create new property {0} to DB",name);
+			insertInto(TABLE_ITEM_PROPERTIES,OWNER,ITEM_ID,PROPERTY_ID,VALUE).values(ownerId,itemId,propertyId,value).execute(db);
+			return new Property(propertyId,name,value,unit);
+		} catch (SQLException e) {
+			throw databaseException("Failed to create new property {0} to DB",name);
+		}
 	}
 
 	private void createIntermediateItemsTable() throws SQLException { // create intermediate table
diff --git a/stock/src/main/java/de/srsoftware/umbrella/stock/StockDb.java b/stock/src/main/java/de/srsoftware/umbrella/stock/StockDb.java
index 5233795..cc8d929 100644
--- a/stock/src/main/java/de/srsoftware/umbrella/stock/StockDb.java
+++ b/stock/src/main/java/de/srsoftware/umbrella/stock/StockDb.java
@@ -2,12 +2,11 @@
 package de.srsoftware.umbrella.stock;
 
 import de.srsoftware.umbrella.core.model.*;
-
 import java.util.Collection;
 
 public interface StockDb {
-	void addProperty(long ownerId, long itemId, long existingPropId, Object value);
-	void addProperty(long ownerId, long itemId, String name, Object value, String unit);
+	Property addProperty(long ownerId, long itemId, long existingPropId, Object value);
+	Property addNewProperty(long ownerId, long itemId, String name, Object value, String unit);
 	Collection<Location> listChildLocations(long parentId);
 	Collection<Location> listCompanyLocations(Company company);
 	Collection<Item>     listItemsAt(long locationId);
diff --git a/stock/src/main/java/de/srsoftware/umbrella/stock/StockModule.java b/stock/src/main/java/de/srsoftware/umbrella/stock/StockModule.java
index 6b715a3..5c1d87d 100644
--- a/stock/src/main/java/de/srsoftware/umbrella/stock/StockModule.java
+++ b/stock/src/main/java/de/srsoftware/umbrella/stock/StockModule.java
@@ -21,10 +21,9 @@ import de.srsoftware.umbrella.core.ModuleRegistry;
 import de.srsoftware.umbrella.core.api.StockService;
 import de.srsoftware.umbrella.core.exceptions.UmbrellaException;
 import de.srsoftware.umbrella.core.model.*;
-import org.json.JSONObject;
-
 import java.io.IOException;
 import java.util.*;
+import org.json.JSONObject;
 
 public class StockModule extends BaseHandler implements StockService {
 
@@ -133,31 +132,32 @@ public class StockModule extends BaseHandler implements StockService {
 
 	private boolean postProperty(UmbrellaUser user, HttpExchange ex) throws IOException {
 		var json = json(ex);
-		if (!(json.get(ID) instanceof Number id)) throw missingFieldException(ID);
 		if (!(json.get(FIELD_ITEM) instanceof JSONObject itemData)) throw missingFieldException(FIELD_ITEM);
 		if (!(itemData.get(OWNER) instanceof JSONObject owner)) throw missingFieldException(OWNER);
+		if (!(itemData.get(ID) instanceof Number itemId)) throw missingFieldException(ID);
 		if (!(json.get("add_prop") instanceof JSONObject propData)) throw missingFieldException("add_prop");
 		if (!propData.has(VALUE)) throw missingFieldException(VALUE);
 		var value = propData.get(VALUE);
 		if (value == null) throw missingFieldException(VALUE);
 		var keys = owner.keySet();
 		if (keys.size() != 1) throw unprocessable("{0} expected to have only one child!",OWNER);
-		var key = new ArrayList<>(keys).getFirst();
-		var ownerId = switch (key) {
-			case COMPANY -> -json.getLong(key);
-			case USER -> json.getLong(key);
-			case null, default -> throw invalidFieldException(format("Single child of {0}", OWNER), format("either {0} or {1}", COMPANY, USER));
+		String key = new ArrayList<>(keys).getFirst();
+		long ownerId = switch (key) {
+			case COMPANY -> -owner.getLong(key);
+			case USER -> owner.getLong(key);
+			default -> throw invalidFieldException(format("Single child of {0}", OWNER), format("either {0} or {1}", COMPANY, USER));
 		};
 
+		Property property = null;
 		if (propData.get("existing_prop_id") instanceof Number existingPropId && existingPropId.longValue() != 0L){
-			stockDb.addProperty(ownerId,id.longValue(),existingPropId.longValue(),value);
+			property = stockDb.addProperty(ownerId,itemId.longValue(),existingPropId.longValue(),value);
 		} else {
 			if (!(propData.get("new_prop") instanceof JSONObject newProp)) throw unprocessable("data must contain either add_prop.existing_prop_id or add_prop.new_prop!");
 			if (!(newProp.get(NAME) instanceof String name) || name.isBlank()) throw unprocessable("data.add_prop.new_prop does not contain name!");
 			var unit = newProp.get(UNIT) instanceof String u ? nullIfEmpty(u) : null;
-			stockDb.addProperty(ownerId,id.longValue(),name,value,unit);
+			property = stockDb.addNewProperty(ownerId,itemId.longValue(),name,value,unit);
 		}
-		return sendEmptyResponse(500,ex);
+		return sendContent(ex,property);
 	}
 
 	@Override