Organize backend into product executable and shared Go modules

backend/shared/database/internal/builder/gaccumulator.go

@@ -0,0 +1,35 @@
+package builderimp
+
+import (
+	"git.sendico.io/tech/sxchnge/shared/database/repository/builder"
+	"go.mongodb.org/mongo-driver/v2/bson"
+)
+
+type groupAccumulatorImp struct {
+	field builder.Field
+	acc   builder.Accumulator
+}
+
+// NewGroupAccumulator creates a new GroupAccumulator for the given field using the specified operator and value.
+func NewGroupAccumulator(field builder.Field, acc builder.Accumulator) builder.GroupAccumulator {
+	return &groupAccumulatorImp{
+		field: field,
+		acc:   acc,
+	}
+}
+
+func (g *groupAccumulatorImp) Field() builder.Field {
+	return g.field
+}
+
+func (g *groupAccumulatorImp) Accumulator() builder.Accumulator {
+	return g.acc
+}
+
+// Build returns a bson.E element for this group accumulator.
+func (g *groupAccumulatorImp) Build() bson.D {
+	return bson.D{{
+		Key:   g.field.Build(),
+		Value: g.acc.Build(),
+	}}
+}