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| usr | bucket | exists_flag |
|---|---|---|
| john | 2021-01-01 00:15:00 | t |
| john | 2021-01-01 00:30:00 | t |
| john | 2021-01-01 00:45:00 | f |
| john | 2021-01-01 01:00:00 | t |
| john | 2021-01-01 01:15:00 | t |
| mark | 2021-01-01 00:15:00 | t |
| mark | 2021-01-01 00:30:00 | f |
| mark | 2021-01-01 00:45:00 | f |
| mark | 2021-01-01 01:00:00 | f |
| mark | 2021-01-01 01:15:00 | f |