diff --git a/pkg/storage/unified/resource/datastore.go b/pkg/storage/unified/resource/datastore.go
index 313f7d43852..931a5b20560 100644
--- a/pkg/storage/unified/resource/datastore.go
+++ b/pkg/storage/unified/resource/datastore.go
@@ -864,11 +864,15 @@ func (d *dataStore) applyBackwardsCompatibleChanges(ctx context.Context, tx db.T
 		return nil
 	}
 
+	generation := event.Object.GetGeneration()
+	if key.Action == DataActionDeleted {
+		generation = 0
+	}
 	_, err := dbutil.Exec(ctx, tx, sqlKVUpdateLegacyResourceHistory, sqlKVLegacyUpdateHistoryRequest{
 		SQLTemplate: sqltemplate.New(kv.dialect),
 		GUID:        key.GUID,
 		PreviousRV:  event.PreviousRV,
-		Generation:  event.Object.GetGeneration(),
+		Generation:  generation,
 	})
 
 	if err != nil {
@@ -910,6 +914,7 @@ func (d *dataStore) applyBackwardsCompatibleChanges(ctx context.Context, tx db.T
 			Resource:    key.Resource,
 			Namespace:   key.Namespace,
 			Name:        key.Name,
+			Action:      action,
 			Folder:      key.Folder,
 			PreviousRV:  event.PreviousRV,
 		})
@@ -920,6 +925,7 @@ func (d *dataStore) applyBackwardsCompatibleChanges(ctx context.Context, tx db.T
 	case DataActionDeleted:
 		_, err := dbutil.Exec(ctx, tx, sqlKVDeleteLegacyResource, sqlKVLegacySaveRequest{
 			SQLTemplate: sqltemplate.New(kv.dialect),
+			Group:       key.Group,
 			Resource:    key.Resource,
 			Namespace:   key.Namespace,
 			Name:        key.Name,
diff --git a/pkg/storage/unified/testing/storage_backend.go b/pkg/storage/unified/testing/storage_backend.go
index 61470f9887a..faf6b70c600 100644
--- a/pkg/storage/unified/testing/storage_backend.go
+++ b/pkg/storage/unified/testing/storage_backend.go
@@ -43,7 +43,6 @@ const (
 	TestCreateNewResource         = "create new resource"
 	TestGetResourceLastImportTime = "get resource last import time"
 	TestOptimisticLocking         = "optimistic locking on concurrent writes"
-	TestKeyPathGeneration         = "key_path generation"
 )
 
 type NewBackendFunc func(ctx context.Context) resource.StorageBackend
diff --git a/pkg/storage/unified/testing/storage_backend_sql_compatibility.go b/pkg/storage/unified/testing/storage_backend_sql_compatibility.go
index 588f70dc868..c133bdfbd7b 100644
--- a/pkg/storage/unified/testing/storage_backend_sql_compatibility.go
+++ b/pkg/storage/unified/testing/storage_backend_sql_compatibility.go
@@ -3,6 +3,7 @@ package test
 import (
 	"context"
 	"fmt"
+	"strings"
 	"testing"
 
 	"github.com/bwmarrin/snowflake"
@@ -64,7 +65,8 @@ func RunSQLStorageBackendCompatibilityTest(t *testing.T, newSqlBackend, newKvBac
 		name string
 		fn   func(*testing.T, resource.StorageBackend, resource.StorageBackend, string, sqldb.DB)
 	}{
-		{TestKeyPathGeneration, runTestIntegrationBackendKeyPathGeneration},
+		{"key_path generation", runTestIntegrationBackendKeyPathGeneration},
+		{"sql backend fields compatibility", runTestSQLBackendFieldsCompatibility},
 	}
 
 	for _, tc := range cases {
@@ -284,3 +286,431 @@ func getAnnotationsJSON(withFolder bool) string {
 	}
 	return ""
 }
+
+// runTestSQLBackendFieldsCompatibility tests that KV backend with RvManager populates all SQL backend legacy fields
+func runTestSQLBackendFieldsCompatibility(t *testing.T, sqlBackend, kvBackend resource.StorageBackend, nsPrefix string, db sqldb.DB) {
+	ctx := testutil.NewDefaultTestContext(t)
+
+	// Create unique namespace for isolation
+	namespace := nsPrefix + "-fields-test"
+
+	// Test SQL backend with 3 resources through complete lifecycle
+	t.Run("SQL Backend Operations", func(t *testing.T) {
+		runSQLBackendFieldsTest(t, sqlBackend, namespace+"-sql", db, ctx)
+	})
+
+	// Test KV backend with 3 resources through complete lifecycle
+	t.Run("KV Backend Operations", func(t *testing.T) {
+		runSQLBackendFieldsTest(t, kvBackend, namespace+"-kv", db, ctx)
+	})
+}
+
+// buildCrossDatabaseQuery converts query placeholders for different database drivers
+func buildCrossDatabaseQuery(driverName, baseQuery string) string {
+	if driverName == "postgres" {
+		// Convert ? placeholders to $1, $2, etc. for PostgreSQL
+		placeholderCount := 1
+		result := baseQuery
+		for {
+			oldResult := result
+			result = strings.Replace(result, "?", fmt.Sprintf("$%d", placeholderCount), 1)
+			if result == oldResult {
+				break
+			}
+			placeholderCount++
+		}
+		return result
+	}
+	// MySQL and SQLite use ? placeholders
+	return baseQuery
+}
+
+// runSQLBackendFieldsTest performs complete resource lifecycle testing and verifies all legacy SQL fields
+func runSQLBackendFieldsTest(t *testing.T, backend resource.StorageBackend, namespace string, db sqldb.DB, ctx context.Context) {
+	// Create storage server from backend
+	server, err := resource.NewResourceServer(resource.ResourceServerOptions{
+		Backend:      backend,
+		AccessClient: claims.FixedAccessClient(true), // Allow all operations for testing
+	})
+	require.NoError(t, err)
+
+	// Resource definitions with different folder configurations
+	resources := []struct {
+		name   string
+		folder string
+	}{
+		{"test-resource-1", ""},            // No folder
+		{"test-resource-2", "test-folder"}, // With folder
+		{"test-resource-3", ""},            // No folder
+	}
+
+	// Track resource versions for each resource
+	resourceVersions := make([][]int64, len(resources)) // [resourceIndex][versionIndex]
+
+	// Create 3 resources
+	for i, res := range resources {
+		key := &resourcepb.ResourceKey{
+			Group:     "playlist.grafana.app",
+			Resource:  "playlists",
+			Namespace: namespace,
+			Name:      res.name,
+		}
+
+		// Create resource JSON with folder annotation and generation=1 for creates
+		resourceJSON := fmt.Sprintf(`{
+			"apiVersion": "playlist.grafana.app/v0alpha1",
+			"kind": "Playlist",
+			"metadata": {
+				"name": "%s",
+				"namespace": "%s",
+				"uid": "test-uid-%d",
+				"generation": 1%s
+			},
+			"spec": {
+				"title": "Test Playlist %d"
+			}
+		}`, res.name, namespace, i+1, getAnnotationsJSON(res.folder != ""), i+1)
+
+		// Create the resource
+		created, err := server.Create(ctx, &resourcepb.CreateRequest{
+			Key:   key,
+			Value: []byte(resourceJSON),
+		})
+		require.NoError(t, err)
+		require.Nil(t, created.Error)
+		require.Greater(t, created.ResourceVersion, int64(0))
+
+		// Store the resource version
+		resourceVersions[i] = append(resourceVersions[i], created.ResourceVersion)
+	}
+
+	// Update 3 resources
+	for i, res := range resources {
+		key := &resourcepb.ResourceKey{
+			Group:     "playlist.grafana.app",
+			Resource:  "playlists",
+			Namespace: namespace,
+			Name:      res.name,
+		}
+
+		// Update resource JSON with generation=2 for updates
+		resourceJSON := fmt.Sprintf(`{
+			"apiVersion": "playlist.grafana.app/v0alpha1",
+			"kind": "Playlist",
+			"metadata": {
+				"name": "%s",
+				"namespace": "%s",
+				"uid": "test-uid-%d",
+				"generation": 2%s
+			},
+			"spec": {
+				"title": "Updated Test Playlist %d"
+			}
+		}`, res.name, namespace, i+1, getAnnotationsJSON(res.folder != ""), i+1)
+
+		// Update the resource using the current resource version
+		currentRV := resourceVersions[i][len(resourceVersions[i])-1]
+		updated, err := server.Update(ctx, &resourcepb.UpdateRequest{
+			Key:             key,
+			Value:           []byte(resourceJSON),
+			ResourceVersion: currentRV,
+		})
+		require.NoError(t, err)
+		require.Nil(t, updated.Error)
+		require.Greater(t, updated.ResourceVersion, currentRV)
+
+		// Store the new resource version
+		resourceVersions[i] = append(resourceVersions[i], updated.ResourceVersion)
+	}
+
+	// Delete first 2 resources (leave the last one to validate resource table)
+	for i, res := range resources[:2] {
+		key := &resourcepb.ResourceKey{
+			Group:     "playlist.grafana.app",
+			Resource:  "playlists",
+			Namespace: namespace,
+			Name:      res.name,
+		}
+
+		// Delete the resource using the current resource version
+		currentRV := resourceVersions[i][len(resourceVersions[i])-1]
+		deleted, err := server.Delete(ctx, &resourcepb.DeleteRequest{
+			Key:             key,
+			ResourceVersion: currentRV,
+		})
+		require.NoError(t, err)
+		require.Nil(t, deleted.Error)
+		require.Greater(t, deleted.ResourceVersion, currentRV)
+
+		// Store the delete resource version
+		resourceVersions[i] = append(resourceVersions[i], deleted.ResourceVersion)
+	}
+
+	// Verify all legacy SQL fields are populated correctly
+	verifyResourceHistoryTable(t, db, namespace, resources, resourceVersions)
+	verifyResourceTable(t, db, namespace, resources, resourceVersions)
+	verifyResourceVersionTable(t, db, namespace, resources, resourceVersions)
+}
+
+// ResourceHistoryRecord represents a row from the resource_history table
+type ResourceHistoryRecord struct {
+	GUID                    string
+	Group                   string
+	Resource                string
+	Namespace               string
+	Name                    string
+	Value                   string
+	Action                  int
+	Folder                  string
+	PreviousResourceVersion int64
+	Generation              int
+	ResourceVersion         int64
+}
+
+// ResourceRecord represents a row from the resource table
+type ResourceRecord struct {
+	GUID                    string
+	Group                   string
+	Resource                string
+	Namespace               string
+	Name                    string
+	Value                   string
+	Action                  int
+	Folder                  string
+	PreviousResourceVersion int64
+	ResourceVersion         int64
+}
+
+// ResourceVersionRecord represents a row from the resource_version table
+type ResourceVersionRecord struct {
+	Group           string
+	Resource        string
+	ResourceVersion int64
+}
+
+// verifyResourceHistoryTable validates all resource_history entries
+func verifyResourceHistoryTable(t *testing.T, db sqldb.DB, namespace string, resources []struct{ name, folder string }, resourceVersions [][]int64) {
+	ctx := t.Context()
+	query := buildCrossDatabaseQuery(db.DriverName(), `
+		SELECT guid, "group", resource, namespace, name, value, action, folder,
+		       previous_resource_version, generation, resource_version
+		FROM resource_history
+		WHERE namespace = ?
+		ORDER BY resource_version ASC
+	`)
+
+	rows, err := db.QueryContext(ctx, query, namespace)
+	require.NoError(t, err)
+	defer func() {
+		_ = rows.Close()
+	}()
+
+	var records []ResourceHistoryRecord
+	for rows.Next() {
+		var record ResourceHistoryRecord
+		err := rows.Scan(
+			&record.GUID, &record.Group, &record.Resource, &record.Namespace, &record.Name,
+			&record.Value, &record.Action, &record.Folder, &record.PreviousResourceVersion,
+			&record.Generation, &record.ResourceVersion,
+		)
+		require.NoError(t, err)
+		records = append(records, record)
+	}
+	require.NoError(t, rows.Err())
+
+	// We expect 8 records total: 3 creates + 3 updates + 2 deletes
+	require.Len(t, records, 8, "Expected 8 resource_history records (3 creates + 3 updates + 2 deletes)")
+
+	// Verify each record - we'll validate in the order they were created (by resource_version)
+	// The records are already sorted by resource_version ASC, so we just need to verify each one
+	recordIndex := 0
+	for resourceIdx, res := range resources {
+		// Check create record (action=1, generation=1)
+		createRecord := records[recordIndex]
+		verifyResourceHistoryRecord(t, createRecord, res, resourceIdx, 1, 0, 1, resourceVersions[resourceIdx][0])
+		recordIndex++
+	}
+
+	for resourceIdx, res := range resources {
+		// Check update record (action=2, generation=2)
+		updateRecord := records[recordIndex]
+		verifyResourceHistoryRecord(t, updateRecord, res, resourceIdx, 2, resourceVersions[resourceIdx][0], 2, resourceVersions[resourceIdx][1])
+		recordIndex++
+	}
+
+	for resourceIdx, res := range resources[:2] {
+		// Check delete record (action=3, generation=0) - only first 2 resources were deleted
+		deleteRecord := records[recordIndex]
+		verifyResourceHistoryRecord(t, deleteRecord, res, resourceIdx, 3, resourceVersions[resourceIdx][1], 0, resourceVersions[resourceIdx][2])
+		recordIndex++
+	}
+}
+
+// verifyResourceHistoryRecord validates a single resource_history record
+func verifyResourceHistoryRecord(t *testing.T, record ResourceHistoryRecord, expectedRes struct{ name, folder string }, resourceIdx, expectedAction int, expectedPrevRV int64, expectedGeneration int, expectedRV int64) {
+	// Validate GUID (should be non-empty)
+	require.NotEmpty(t, record.GUID, "GUID should not be empty")
+
+	// Validate group/resource/namespace/name
+	require.Equal(t, "playlist.grafana.app", record.Group)
+	require.Equal(t, "playlists", record.Resource)
+	require.Equal(t, expectedRes.name, record.Name)
+
+	// Validate value contains expected JSON - server modifies/formats the JSON differently for different operations
+	// Check for both formats (with and without space after colon)
+	nameFound := strings.Contains(record.Value, fmt.Sprintf(`"name": "%s"`, expectedRes.name)) ||
+		strings.Contains(record.Value, fmt.Sprintf(`"name":"%s"`, expectedRes.name))
+	require.True(t, nameFound, "JSON should contain the expected name field")
+
+	kindFound := strings.Contains(record.Value, `"kind": "Playlist"`) ||
+		strings.Contains(record.Value, `"kind":"Playlist"`)
+	require.True(t, kindFound, "JSON should contain the expected kind field")
+
+	// Validate action
+	require.Equal(t, expectedAction, record.Action)
+
+	// Validate folder
+	if expectedRes.folder == "" {
+		require.Equal(t, "", record.Folder, "Folder should be empty when no folder annotation")
+	} else {
+		require.Equal(t, expectedRes.folder, record.Folder, "Folder should match annotation")
+	}
+
+	// Validate previous_resource_version
+	// For KV backend operations, resource versions are stored as snowflake format
+	// but expectedPrevRV is in microsecond format, so we need to use IsRvEqual for comparison
+	if strings.Contains(record.Namespace, "-kv") {
+		require.True(t, rvmanager.IsRvEqual(record.PreviousResourceVersion, expectedPrevRV),
+			"Previous resource version should match (KV backend snowflake format)")
+	} else {
+		require.Equal(t, expectedPrevRV, record.PreviousResourceVersion)
+	}
+
+	// Validate generation: 1 for create, 2 for update, 0 for delete
+	require.Equal(t, expectedGeneration, record.Generation)
+
+	// Validate resource_version
+	// For KV backend operations, resource versions are stored as snowflake format
+	if strings.Contains(record.Namespace, "-kv") {
+		require.True(t, rvmanager.IsRvEqual(record.ResourceVersion, expectedRV),
+			"Resource version should match (KV backend snowflake format)")
+	} else {
+		require.Equal(t, expectedRV, record.ResourceVersion)
+	}
+}
+
+// verifyResourceTable validates the resource table (latest state only)
+func verifyResourceTable(t *testing.T, db sqldb.DB, namespace string, resources []struct{ name, folder string }, resourceVersions [][]int64) {
+	ctx := t.Context()
+	query := buildCrossDatabaseQuery(db.DriverName(), `
+		SELECT guid, "group", resource, namespace, name, value, action, folder,
+		       previous_resource_version, resource_version
+		FROM resource
+		WHERE namespace = ?
+		ORDER BY name ASC
+	`)
+
+	rows, err := db.QueryContext(ctx, query, namespace)
+	require.NoError(t, err)
+	defer func() {
+		_ = rows.Close()
+	}()
+
+	var records []ResourceRecord
+	for rows.Next() {
+		var record ResourceRecord
+		err := rows.Scan(
+			&record.GUID, &record.Group, &record.Resource, &record.Namespace, &record.Name,
+			&record.Value, &record.Action, &record.Folder, &record.PreviousResourceVersion,
+			&record.ResourceVersion,
+		)
+		require.NoError(t, err)
+		records = append(records, record)
+	}
+	require.NoError(t, rows.Err())
+
+	// We expect 1 record since only 2 resources were deleted (the 3rd remains)
+	require.Len(t, records, 1, "Expected 1 resource record since only 2 resources were deleted")
+
+	// Validate the remaining record (should be the 3rd resource after update)
+	record := records[0]
+	require.Equal(t, "playlist.grafana.app", record.Group)
+	require.Equal(t, "playlists", record.Resource)
+	require.Equal(t, "test-resource-3", record.Name)
+
+	// Should be an update action (2) - resource table stores latest action
+	require.Equal(t, 2, record.Action)
+
+	// Validate value contains expected JSON
+	nameFound := strings.Contains(record.Value, fmt.Sprintf(`"name": "%s"`, "test-resource-3")) ||
+		strings.Contains(record.Value, fmt.Sprintf(`"name":"%s"`, "test-resource-3"))
+	require.True(t, nameFound, "JSON should contain the expected name field")
+
+	kindFound := strings.Contains(record.Value, `"kind": "Playlist"`) ||
+		strings.Contains(record.Value, `"kind":"Playlist"`)
+	require.True(t, kindFound, "JSON should contain the expected kind field")
+
+	// Folder should be empty (3rd resource has no folder annotation)
+	require.Equal(t, "", record.Folder, "3rd resource should have no folder")
+
+	// GUID should be non-empty
+	require.NotEmpty(t, record.GUID, "GUID should not be empty")
+
+	// Resource version should match the expected version for test-resource-3 (updated version)
+	expectedRV := resourceVersions[2][1] // test-resource-3's update version
+	if strings.Contains(namespace, "-kv") {
+		require.True(t, rvmanager.IsRvEqual(record.ResourceVersion, expectedRV),
+			"Resource version should match (KV backend snowflake format)")
+	} else {
+		require.Equal(t, expectedRV, record.ResourceVersion)
+	}
+}
+
+// verifyResourceVersionTable validates the resource_version table
+func verifyResourceVersionTable(t *testing.T, db sqldb.DB, namespace string, resources []struct{ name, folder string }, resourceVersions [][]int64) {
+	ctx := t.Context()
+	query := buildCrossDatabaseQuery(db.DriverName(), `
+		SELECT "group", resource, resource_version
+		FROM resource_version
+		WHERE "group" = ? AND resource = ?
+	`)
+
+	// Check that we have exactly one entry for playlist.grafana.app/playlists
+	rows, err := db.QueryContext(ctx, query, "playlist.grafana.app", "playlists")
+	require.NoError(t, err)
+	defer func() {
+		_ = rows.Close()
+	}()
+
+	var records []ResourceVersionRecord
+	for rows.Next() {
+		var record ResourceVersionRecord
+		err := rows.Scan(&record.Group, &record.Resource, &record.ResourceVersion)
+		require.NoError(t, err)
+		records = append(records, record)
+	}
+	require.NoError(t, rows.Err())
+
+	// We expect exactly 1 record for the group+resource combination
+	require.Len(t, records, 1, "Expected 1 resource_version record for playlist.grafana.app/playlists")
+
+	record := records[0]
+	require.Equal(t, "playlist.grafana.app", record.Group)
+	require.Equal(t, "playlists", record.Resource)
+
+	// Find the highest resource version across all resources
+	var maxRV int64
+	for _, rvs := range resourceVersions {
+		for _, rv := range rvs {
+			if rv > maxRV {
+				maxRV = rv
+			}
+		}
+	}
+
+	// The resource_version table should contain the latest RV for the group+resource
+	// It might be slightly higher due to RV manager operations, so check it's at least our max
+	require.GreaterOrEqual(t, record.ResourceVersion, maxRV, "resource_version should be at least the latest RV we tracked")
+	// But it shouldn't be too much higher (within a reasonable range)
+	require.LessOrEqual(t, record.ResourceVersion, maxRV+100, "resource_version shouldn't be much higher than expected")
+}