Add dynamic configuration for doing a mismatch post-check

service/src/main/java/org/whispersystems/textsecuregcm/configuration/dynamic/DynamicAccountsDynamoDbMigrationConfiguration.java

@@ -20,6 +20,9 @@ public class DynamicAccountsDynamoDbMigrationConfiguration {
   @JsonProperty
   boolean readEnabled;
 
+  @JsonProperty
+  boolean postCheckMismatches;
+
   @JsonProperty
   boolean logMismatches;
 
@@ -70,6 +73,10 @@ public class DynamicAccountsDynamoDbMigrationConfiguration {
     return readEnabled;
   }
 
+  public boolean isPostCheckMismatches() {
+    return postCheckMismatches;
+  }
+
   public boolean isLogMismatches() {
     return logMismatches;
   }

service/src/main/java/org/whispersystems/textsecuregcm/storage/AccountsManager.java

@@ -731,7 +731,10 @@ public class AccountsManager {
 
           maybeUUid.ifPresent(uuid -> {
 
-            mismatchedAccounts.put(uuid);
+            if (dynamicConfigurationManager.getConfiguration().getAccountsDynamoDbMigrationConfiguration()
+                .isPostCheckMismatches()) {
+              mismatchedAccounts.put(uuid);
+            }
 
             if (dynamicConfigurationManager.getConfiguration().getAccountsDynamoDbMigrationConfiguration()
                 .isLogMismatches()) {

service/src/main/java/org/whispersystems/textsecuregcm/storage/MigrationMismatchedAccountsTableCrawler.java

@@ -64,6 +64,11 @@ public class MigrationMismatchedAccountsTableCrawler extends ManagedPeriodicWork
   @Override
   public void doPeriodicWork() {
 
+    if (!dynamicConfigurationManager.getConfiguration().getAccountsDynamoDbMigrationConfiguration()
+        .isPostCheckMismatches()) {
+      return;
+    }
+
     final List<UUID> uuids = this.mismatchedAccounts.getUuids(MAX_BATCH_SIZE);
 
     final List<UUID> processedUuids = new ArrayList<>(uuids.size());