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Mention "phantom reads" in README (#2128)

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api/paidAction/README.md
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@ -205,7 +205,7 @@ The ONLY exception to this are for the `users` table where we store a stacker's
We use a `read committed` isolation level for actions. This means paid actions need to be mindful of concurrency issues. Specifically, reading data from the database and then writing it back in `read committed` is a common source of consistency bugs (aka serialization anamolies). We use a `read committed` isolation level for actions. This means paid actions need to be mindful of concurrency issues. Specifically, reading data from the database and then writing it back in `read committed` is a common source of consistency bugs (aka serialization anamolies).
### This is a big deal ### This is a big deal
1. If you read from the database and intend to use that data to write to the database, and it's possible that a concurrent transaction could change the data you've read (it usually is), you need to be prepared to handle that. 1. If you read from the database and intend to use that data to write to the database, and it's possible that a concurrent transaction could change the data you've read (it usually is), you need to be prepared to handle that (see [_phantom reads_](https://www.postgresql.org/docs/16/transaction-iso.html)).
2. This applies to **ALL**, and I really mean **ALL**, read data regardless of how you read the data within the `read committed` transaction: 2. This applies to **ALL**, and I really mean **ALL**, read data regardless of how you read the data within the `read committed` transaction:
- independent statements - independent statements
- `WITH` queries (CTEs) in the same statement - `WITH` queries (CTEs) in the same statement