Add doesUsenameExist query

src/operations/feed.gql

@@ -3,7 +3,7 @@ query GetFeed(
   $after: String = null
   $filters: VideoFilterInput = null
 ) {
-  getFeedVideos(limit: $limit, after: $after, filters: $filters) {
+  getUserVideos(limit: $limit, after: $after, filters: $filters) {
     videos {
       id
       owner {

src/operations/shots.gql

@@ -67,14 +67,12 @@ query GetShotsWithMetadataFilterResult(
   $shotsOrdering: GetShotsOrdering
   $limit: Int
   $ids: [Int!]
-  $countRespectsLimit: Boolean
 ) {
   getOrderedShots(
     filterInput: $filterInput
     shotsOrdering: $shotsOrdering
     limit: $limit
     ids: $ids
-    countRespectsLimit: $countRespectsLimit
   ) {
     count
     shots {

src/operations/user.gql

@@ -134,4 +134,4 @@ query getUserFollowingFollowers {
 
 query doesUsernameExist($candidateUsername: String!) {
   doesUsernameExist(candidateUsername: $candidateUsername)
-}
+}

src/schema.gql

@@ -15,20 +15,17 @@ type Query {
     ids: [Int!] = null
     shotsOrdering: GetShotsOrdering = null
     limit: Int! = 500
-    countRespectsLimit: Boolean! = false
   ): GetShotsResult!
   getShotsWithMetadata(
     filterInput: FilterInput!
     ids: [Int!] = null
     shotsPagination: GetShotsPagination = null
     limit: Int! = 500
-    countRespectsLimit: Boolean! = false
   ): GetShotsResult!
   getShots(
     filterInput: FilterInput!
     shotsPagination: GetShotsPagination = null
     limit: Int! = 500
-    countRespectsLimit: Boolean! = false
   ): [ShotGQL!]!
   getShotsByIds(ids: [Int!]!): [ShotGQL!]!
   getShotAnnotationTypes(errorTypes: Boolean = false): [ShotAnnotationTypeGQL!]!