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RTree on ESP32 SQLite Version
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I am not sure about the issue with `RTree`, but would like to remind that ESP32 is a memory constrained environment and not all features of SQLite are expected work without issues.

If you have PSRAM on your board you might try enabling it for the sqlite3 library using the info mentioned in this link: https://github.com/siara-cc/esp32_arduino_sqlite3_lib/issues/45#issue-899170152