Why this database structure?

[KristijanZic]

Why do we need to have this specific database structure if we can have a single geohash with maximum precision? Can't you query the firebase via substring to get the other zoom levels?

[meanllbrl]

Since we are not searching for just one geohash, we need to use arrayContainsAny to check a pool of related geohashes at specific precisions. If we did it the way you suggested, it would create unnecessary GET requests and slow down the process. However, these are just my guesses; I will investigate more carefully to see if it would work. Thanks.