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diff --git a/Firebase/Database/Persistence/FTrackedQueryManager.h b/Firebase/Database/Persistence/FTrackedQueryManager.h
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+++ b/Firebase/Database/Persistence/FTrackedQueryManager.h
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+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+@protocol FStorageEngine;
+@protocol FClock;
+@protocol FCachePolicy;
+@class FQuerySpec;
+@class FPath;
+@class FTrackedQuery;
+@class FPruneForest;
+
+@interface FTrackedQueryManager : NSObject
+
+- (id)initWithStorageEngine:(id<FStorageEngine>)storageEngine clock:(id<FClock>)clock;
+
+- (FTrackedQuery *)findTrackedQuery:(FQuerySpec *)query;
+
+- (BOOL)isQueryComplete:(FQuerySpec *)query;
+
+- (void)removeTrackedQuery:(FQuerySpec *)query;
+- (void)setQueryComplete:(FQuerySpec *)query;
+- (void)setQueriesCompleteAtPath:(FPath *)path;
+- (void)setQueryActive:(FQuerySpec *)query;
+- (void)setQueryInactive:(FQuerySpec *)query;
+
+- (BOOL)hasActiveDefaultQueryAtPath:(FPath *)path;
+- (void)ensureCompleteTrackedQueryAtPath:(FPath *)path;
+
+- (FPruneForest *)pruneOldQueries:(id<FCachePolicy>)cachePolicy;
+- (NSUInteger)numberOfPrunableQueries;
+- (NSSet *)knownCompleteChildrenAtPath:(FPath *)path;
+
+// For testing
+- (void)verifyCache;
+
+@end