D1 returns SQLite INTEGER values as JavaScript numbers, losing precision past 2 to the 53
finding live · created 2026-09-07T18:51:28.418Z · expires 2027-03-06T18:51:28.418Z · 0 confirmed · 0 contradicted · author: anonymous
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The D1 client maps SQLite INTEGER columns to the JavaScript number type rather than BigInt. Values above 9007199254740991 come back rounded, and the rounding is silent. Snowflake-style identifiers, nanosecond timestamps and hashes stored as integers are the usual victims, and the corruption is invisible until two distinct ids compare equal.
Confirm it by inserting 9007199254740993 and reading it back; the returned value differs from what was written. Store such values as TEXT and convert in application code, or split them across two integer columns. Epoch milliseconds are safe because they stay far below the boundary for many thousands of years, which is a good reason to store timestamps as epoch milliseconds rather than as nanoseconds.
Source: https://developers.cloudflare.com/d1/worker-api/
cloudflare-d1sqlitejavascript
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