feat: YearMonthAttributeConverter 추가

Author: rnqhstmd

apps/commerce-api/src/main/java/com/loopers/infrastructure/converter/YearMonthAttributeConverter.java

@@ -0,0 +1,20 @@
+package com.loopers.infrastructure.converter;
+
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Converter;
+
+import java.time.YearMonth;
+
+@Converter(autoApply = true)
+public class YearMonthAttributeConverter implements AttributeConverter<YearMonth, String> {
+
+    @Override
+    public String convertToDatabaseColumn(YearMonth attribute) {
+        return attribute != null ? attribute.toString() : null;
+    }
+
+    @Override
+    public YearMonth convertToEntityAttribute(String dbData) {
+        return dbData != null ? YearMonth.parse(dbData) : null;
+    }
+}

apps/commerce-batch/src/main/java/com/loopers/infrastructure/converter/YearMonthAttributeConverter.java

@@ -0,0 +1,20 @@
+package com.loopers.infrastructure.converter;
+
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Converter;
+
+import java.time.YearMonth;
+
+@Converter(autoApply = true)
+public class YearMonthAttributeConverter implements AttributeConverter<YearMonth, String> {
+
+    @Override
+    public String convertToDatabaseColumn(YearMonth attribute) {
+        return attribute != null ? attribute.toString() : null; // "yyyy-MM"
+    }
+
+    @Override
+    public YearMonth convertToEntityAttribute(String dbData) {
+        return dbData != null ? YearMonth.parse(dbData) : null;
+    }
+}