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myronkaifung
approved these changes
Mar 31, 2026
kurbycchua
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Apr 3, 2026
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| \* *User ID or Device ID is technically optional in connector setup, but without one, events can't be linked to a user profile or attributed to a consistent identity.* | ||
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| Each event supports a maximum of 255 properties. Property names and values longer than 255 characters are truncated. |
Collaborator
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Just noticed this (was from the Original doc which I just corrected)
- We should say "Each event supports a maximum of 255 properties. Property names longer than 255 characters are truncated."
- One thing I notice using the AI is that it failed to mention data type link here https://docs.mixpanel.com/docs/data-structure/property-reference/data-type
- It also failed to perhaps link the technical limits: https://docs.mixpanel.com/docs/data-structure/events-and-properties#what-are-the-limits-of-events-and-properties
Since there are essentially more limits beyond what we state here I think we should at least add that link
| For group-level analysis using [Group Analytics](/docs/data-structure/group-analytics), the Group Key (e.g. `account_id`) plays the same role — make sure it's consistent across event and group profile tables. | ||
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| <Callout type="info"> | ||
| **Pro tip**: Unlike client-side SDK tracking, Mirror doesn't handle ID bridging automatically. Validate your identity mapping before your first sync, not after. A mismatch across millions of rows is expensive to fix. |
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Thinking we should link the ID management page in "Validate you identity mapping" https://docs.mixpanel.com/docs/tracking-methods/id-management
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