Revert "SQL Backend (#11048)"

This reverts commit 06fef2a.

lib/backend/backend.go

@@ -25,10 +25,10 @@ import (
 	"strings"
 	"time"
 
-	"github.com/gravitational/teleport/api/types"
 	"github.com/gravitational/trace"
-
 	"github.com/jonboulle/clockwork"
+
+	"github.com/gravitational/teleport/api/types"
 )
 
 // Forever means that object TTL will not expire unless deleted
@@ -232,36 +232,6 @@ func (p Params) GetString(key string) string {
 	return s
 }
 
-// Cleanse fixes an issue with yamlv2 decoding nested sections to
-// map[interface{}]interface{} rather than map[string]interface{}.
-// ObjectToStruct will fail on the former. yamlv3 corrects this behavior.
-// All non-string keys are dropped.
-func (p Params) Cleanse() {
-	for key, value := range p {
-		if mapValue, ok := value.(map[interface{}]interface{}); ok {
-			p[key] = convertParams(mapValue)
-		}
-	}
-}
-
-// convertParams converts from a map[interface{}]interface{} to
-// map[string]interface{} recursively. All non-string keys are dropped.
-// This function is called by Params.Cleanse.
-func convertParams(from map[interface{}]interface{}) (to map[string]interface{}) {
-	to = make(map[string]interface{}, len(from))
-	for key, value := range from {
-		strKey, ok := key.(string)
-		if !ok {
-			continue
-		}
-		if mapValue, ok := value.(map[interface{}]interface{}); ok {
-			value = convertParams(mapValue)
-		}
-		to[strKey] = value
-	}
-	return to
-}
-
 // NoLimit specifies no limits
 const NoLimit = 0
 

lib/backend/backend_test.go

@@ -55,28 +55,3 @@ func TestRangeEnd(t *testing.T) {
 		})
 	}
 }
-
-func TestParamsCleanse(t *testing.T) {
-	source := Params{
-		"Addr": "localhost:345",
-		"TLS": map[interface{}]interface{}{
-			"CAFile": "/path/to/file",
-			"Certs": map[interface{}]interface{}{
-				"Cert": "cert.crt",
-				"Key":  "key.crt",
-			},
-		},
-	}
-	expect := Params{
-		"Addr": "localhost:345",
-		"TLS": map[string]interface{}{
-			"CAFile": "/path/to/file",
-			"Certs": map[string]interface{}{
-				"Cert": "cert.crt",
-				"Key":  "key.crt",
-			},
-		},
-	}
-	source.Cleanse()
-	require.Equal(t, source, expect)
-}