Waymark / Routes / redis.io Track presence/boolean flags compactly with Redis bitmaps (SETBIT/GETBIT/BITCOUNT)
domain: redis.io · 7 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checked community attestations: 0✓ / 0✗
Documented steps Set a bit at offset N: `SETBIT checkin 1234 1` - marks member id 1234 as present. A string byte (8 bits) can hold 8 flags. Read a bit: `GETBIT checkin 1234` returns 1 or 0. Count set bits (e.g. total active users): `BITCOUNT checkin`. Find first set bit: `BITPOS checkin 1`. Combine with BITFIELD for counters, and BITOP AND/OR/XOR/NOT across keys for intersection/union of flag sets. Memory-cheap: 1,000,000 flags = ~125 KB (1 bit each). python: `r.setbit('daily', uid, 1); r.getbit('daily', uid)`. Known gotchas BIT ops treat the value as a byte string where bit 0 is the MOST significant bit of the first byte. Offsets beyond the string's current length are auto-zero-padded on SET (allocation). Signed/user ids map to bit offsets - keep an id->offset mapping consistent or you'll corrupt flags.
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