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## Problem
If a user provides a wrong database name in the connection string, it
should be logged as a user error, not postgres error.
I found 4 different places where we log such errors:
1. `proxy/src/stream.rs:193`, e.g.:
```
{"timestamp":"2025-07-15T11:33:35.660026Z","level":"INFO","message":"forwarding error to user","fields":{"kind":"postgres","msg":"database \"[redacted]\" does not exist"},"spans":{"connect_request#9":{"protocol":"tcp","session_id":"ce1f2c90-dfb5-44f7-b9e9-8b8535e8b9b8","conn_info":"[redacted]","ep":"[redacted]","role":"[redacted]"}},"thread_id":22,"task_id":"370407867","target":"proxy::stream","src":"proxy/src/stream.rs:193","extract":{"ep":"[redacted]","session_id":"ce1f2c90-dfb5-44f7-b9e9-8b8535e8b9b8"}}
```
2. `proxy/src/pglb/mod.rs:137`, e.g.:
```
{"timestamp":"2025-07-15T11:37:44.340497Z","level":"WARN","message":"per-client task finished with an error: Couldn't connect to compute node: db error: FATAL: database \"[redacted]\" does not exist","spans":{"connect_request#8":{"protocol":"tcp","session_id":"763baaac-d039-4f4d-9446-c149e32660eb","conn_info":"[redacted]","ep":"[redacted]","role":"[redacted]"}},"thread_id":14,"task_id":"866658139","target":"proxy::pglb","src":"proxy/src/pglb/mod.rs:137","extract":{"ep":"[redacted]","session_id":"763baaac-d039-4f4d-9446-c149e32660eb"}}
```
3. `proxy/src/serverless/mod.rs:451`, e.g. (note that the error is
repeated 4 times — retries?):
```
{"timestamp":"2025-07-15T11:37:54.515891Z","level":"WARN","message":"error in websocket connection: Couldn't connect to compute node: db error: FATAL: database \"[redacted]\" does not exist: Couldn't connect to compute node: db error: FATAL: database \"[redacted]\" does not exist: db error: FATAL: database \"[redacted]\" does not exist: FATAL: database \"[redacted]\" does not exist","spans":{"http_conn#8":{"conn_id":"ec7780db-a145-4f0e-90df-0ba35f41b828"},"connect_request#9":{"protocol":"ws","session_id":"1eaaeeec-b671-4153-b1f4-247839e4b1c7","conn_info":"[redacted]","ep":"[redacted]","role":"[redacted]"}},"thread_id":10,"task_id":"366331699","target":"proxy::serverless","src":"proxy/src/serverless/mod.rs:451","extract":{"conn_id":"ec7780db-a145-4f0e-90df-0ba35f41b828","ep":"[redacted]","session_id":"1eaaeeec-b671-4153-b1f4-247839e4b1c7"}}
```
4. `proxy/src/serverless/sql_over_http.rs:219`, e.g.
```
{"timestamp":"2025-07-15T10:32:34.866603Z","level":"INFO","message":"forwarding error to user","fields":{"kind":"postgres","error":"could not connect to postgres in compute","msg":"database \"[redacted]\" does not exist"},"spans":{"http_conn#19":{"conn_id":"7da08203-5dab-45e8-809f-503c9019ec6b"},"connect_request#5":{"protocol":"http","session_id":"68387f1c-cbc8-45b3-a7db-8bb1c55ca809","conn_info":"[redacted]","ep":"[redacted]","role":"[redacted]"}},"thread_id":17,"task_id":"16432250","target":"proxy::serverless::sql_over_http","src":"proxy/src/serverless/sql_over_http.rs:219","extract":{"conn_id":"7da08203-5dab-45e8-809f-503c9019ec6b","ep":"[redacted]","session_id":"68387f1c-cbc8-45b3-a7db-8bb1c55ca809"}}
```
This PR directly addresses 1 and 4. I _think_ it _should_ also help with
2 and 3, although in those places we don't seem to log `kind`, so I'm
not quite sure. I'm also confused why in 3 the error is repeated
multiple times.
## Summary of changes
Resolves https://github.com/neondatabase/neon/issues/9440
This directory contains libraries that are specific for proxy.
Currently, it contains a signficant fork/refactoring of rust-postgres that no longer reflects the API of the original library. Since it was so significant, it made sense to upgrade it to it's own set of libraries.
Proxy needs unique access to the protocol, which explains why such heavy modifications were necessary.