diff --git a/backend/src/main/java/com/bakdata/conquery/models/config/DatabaseConfig.java b/backend/src/main/java/com/bakdata/conquery/models/config/DatabaseConfig.java
index b42aa9bf0e..86a6aaa039 100644
--- a/backend/src/main/java/com/bakdata/conquery/models/config/DatabaseConfig.java
+++ b/backend/src/main/java/com/bakdata/conquery/models/config/DatabaseConfig.java
@@ -2,9 +2,11 @@
 
 import lombok.Builder;
 import lombok.Data;
+import lombok.extern.jackson.Jacksonized;
 
 @Data
 @Builder
+@Jacksonized
 public class DatabaseConfig {
 
 	private static final String DEFAULT_PRIMARY_COLUMN = "pid";
diff --git a/backend/src/main/java/com/bakdata/conquery/models/config/SqlConnectorConfig.java b/backend/src/main/java/com/bakdata/conquery/models/config/SqlConnectorConfig.java
index 2a65aa5ca6..cfce88537b 100644
--- a/backend/src/main/java/com/bakdata/conquery/models/config/SqlConnectorConfig.java
+++ b/backend/src/main/java/com/bakdata/conquery/models/config/SqlConnectorConfig.java
@@ -3,15 +3,20 @@
 import java.util.Map;
 
 import com.bakdata.conquery.models.datasets.Dataset;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import io.dropwizard.validation.ValidationMethod;
+import jakarta.validation.Valid;
 import lombok.AccessLevel;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
+import lombok.extern.jackson.Jacksonized;
 
 @Data
 @Builder
+@Jacksonized
 @NoArgsConstructor
 @AllArgsConstructor
 public class SqlConnectorConfig {
@@ -27,10 +32,19 @@ public class SqlConnectorConfig {
 	 * Keys must match the name of existing {@link Dataset}s.
 	 */
 	@Getter(AccessLevel.PRIVATE)
-	private Map<String, DatabaseConfig> databaseConfigs;
+	private Map<String, @Valid DatabaseConfig> databaseConfigs;
 
 	public DatabaseConfig getDatabaseConfig(Dataset dataset) {
 		return databaseConfigs.get(dataset.getName());
 	}
 
+	@JsonIgnore
+	@ValidationMethod(message = "At lease 1 DatabaseConfig has to be present if SqlConnector config is enabled")
+	public boolean isValidSqlConnectorConfig() {
+		if (!enabled) {
+			return true;
+		}
+		return databaseConfigs != null && !databaseConfigs.isEmpty();
+	}
+
 }
diff --git a/backend/src/main/java/com/bakdata/conquery/models/datasets/Table.java b/backend/src/main/java/com/bakdata/conquery/models/datasets/Table.java
index 8439974550..26a5c19389 100644
--- a/backend/src/main/java/com/bakdata/conquery/models/datasets/Table.java
+++ b/backend/src/main/java/com/bakdata/conquery/models/datasets/Table.java
@@ -41,7 +41,7 @@ public class Table extends Labeled<TableId> implements NamespacedIdentifiable<Ta
 	 */
 	@Nullable
 	@JsonManagedReference
-	private Column primaryColum;
+	private Column primaryColumn;
 
 	@ValidationMethod(message = "More than one column map to the same secondaryId")
 	@JsonIgnore
diff --git a/backend/src/main/java/com/bakdata/conquery/util/TablePrimaryColumnUtil.java b/backend/src/main/java/com/bakdata/conquery/util/TablePrimaryColumnUtil.java
index 8ed9cafaf9..685bdf254f 100644
--- a/backend/src/main/java/com/bakdata/conquery/util/TablePrimaryColumnUtil.java
+++ b/backend/src/main/java/com/bakdata/conquery/util/TablePrimaryColumnUtil.java
@@ -7,10 +7,10 @@
 
 public class TablePrimaryColumnUtil {
 
-	public static Field<Object> findPrimaryColumn(Table table, DatabaseConfig sqlConfig) {
-		String primaryColumnName = table.getPrimaryColum() == null
-								   ? sqlConfig.getPrimaryColumn()
-								   : table.getPrimaryColum().getName();
+	public static Field<Object> findPrimaryColumn(Table table, DatabaseConfig databaseConfig) {
+		String primaryColumnName = table.getPrimaryColumn() == null
+								   ? databaseConfig.getPrimaryColumn()
+								   : table.getPrimaryColumn().getName();
 		return DSL.field(DSL.name(table.getName(), primaryColumnName));
 	}
 
diff --git a/backend/src/test/java/com/bakdata/conquery/integration/common/RequiredTable.java b/backend/src/test/java/com/bakdata/conquery/integration/common/RequiredTable.java
index 55a3155cfd..3de4cf93bf 100644
--- a/backend/src/test/java/com/bakdata/conquery/integration/common/RequiredTable.java
+++ b/backend/src/test/java/com/bakdata/conquery/integration/common/RequiredTable.java
@@ -40,7 +40,7 @@ public class RequiredTable {
 
     public Table toTable(Dataset dataset, CentralRegistry centralRegistry) {
         Table table = new Table();
-		table.setPrimaryColum(primaryColumn.toColumn(table, centralRegistry));
+		table.setPrimaryColumn(primaryColumn.toColumn(table, centralRegistry));
         table.setDataset(dataset);
         table.setName(name);
         table.setColumns(Arrays.stream(columns)