feat: update sql server flex configuration for user and database (#46)

## Description

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At least please give us some description what you are trying to achieve and why your change is needed. -->

relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] Docs are up-to-date: `make generate-docs` (will be checked by CI)
- [ ] Unit tests got implemented or updated
- [ ] Acceptance tests got implemented or updated (see e.g. [here](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Reviewed-on: #46
Reviewed-by: Marcel_Henselin <marcel.henselin@stackit.cloud>
Co-authored-by: Andre Harms <andre.harms@stackit.cloud>
Co-committed-by: Andre Harms <andre.harms@stackit.cloud>

stackit/internal/services/sqlserverflexbeta/database/mapper.go

@@ -0,0 +1,97 @@
+package sqlserverflexbeta
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/hashicorp/terraform-plugin-framework/types"
+	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/pkg_gen/sqlserverflexbeta"
+	"tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/stackit/internal/utils"
+)
+
+// mapFields maps fields from a ListDatabase API response to a resourceModel for the data source.
+func mapFields(source *sqlserverflexbeta.GetDatabaseResponse, model *dataSourceModel, region string) error {
+	if source == nil {
+		return fmt.Errorf("response is nil")
+	}
+	if source.Id == nil || *source.Id == 0 {
+		return fmt.Errorf("id not present")
+	}
+	if model == nil {
+		return fmt.Errorf("model given is nil")
+	}
+
+	var databaseId int64
+	if model.Id.ValueInt64() != 0 {
+		databaseId = model.Id.ValueInt64()
+	} else if source.Id != nil {
+		databaseId = *source.Id
+	} else {
+		return fmt.Errorf("database id not present")
+	}
+
+	model.Id = types.Int64Value(databaseId)
+	model.DatabaseName = types.StringValue(source.GetName())
+	model.Name = types.StringValue(source.GetName())
+	model.Owner = types.StringValue(strings.Trim(source.GetOwner(), "\""))
+	model.Region = types.StringValue(region)
+	model.ProjectId = types.StringValue(model.ProjectId.ValueString())
+	model.InstanceId = types.StringValue(model.InstanceId.ValueString())
+	model.CompatibilityLevel = types.Int64Value(source.GetCompatibilityLevel())
+	model.CollationName = types.StringValue(source.GetCollationName())
+
+	model.TerraformId = utils.BuildInternalTerraformId(
+		model.ProjectId.ValueString(),
+		region,
+		model.InstanceId.ValueString(),
+		model.DatabaseName.ValueString(),
+	)
+
+	return nil
+}
+
+// mapResourceFields maps fields from a ListDatabase API response to a resourceModel for the resource.
+func mapResourceFields(source *sqlserverflexbeta.GetDatabaseResponse, model *resourceModel, region string) error {
+	if source == nil {
+		return fmt.Errorf("response is nil")
+	}
+	if source.Id == nil || *source.Id == 0 {
+		return fmt.Errorf("id not present")
+	}
+	if model == nil {
+		return fmt.Errorf("model input is nil")
+	}
+
+	var databaseId int64
+	if model.Id.ValueInt64() != 0 {
+		databaseId = model.Id.ValueInt64()
+	} else if source.Id != nil {
+		databaseId = *source.Id
+	} else {
+		return fmt.Errorf("database id not present")
+	}
+
+	model.Id = types.Int64Value(databaseId)
+	model.DatabaseName = types.StringValue(source.GetName())
+	model.Name = types.StringValue(source.GetName())
+	model.Owner = types.StringValue(strings.Trim(source.GetOwner(), "\""))
+	model.Region = types.StringValue(region)
+	model.ProjectId = types.StringValue(model.ProjectId.ValueString())
+	model.InstanceId = types.StringValue(model.InstanceId.ValueString())
+
+	return nil
+}
+
+// toCreatePayload converts the resource model to an API create payload.
+func toCreatePayload(model *resourceModel) (*sqlserverflexbeta.CreateDatabaseRequestPayload, error) {
+	if model == nil {
+		return nil, fmt.Errorf("nil model")
+	}
+
+	return &sqlserverflexbeta.CreateDatabaseRequestPayload{
+		Name:          model.Name.ValueStringPointer(),
+		Owner:         model.Owner.ValueStringPointer(),
+		Collation:     model.Collation.ValueStringPointer(),
+		Compatibility: model.Compatibility.ValueInt64Pointer(),
+	}, nil
+}