refactor: drop postgres leftovers, narrow bootstrap api

crates/adapters/http-axum/src/errors.rs

@@ -7,7 +7,6 @@ use domain::errors::DomainError;
 
 pub const NOT_FOUND: &str = "NOT_FOUND";
 pub const INVALID_INPUT: &str = "INVALID_INPUT";
-pub const CONFLICT: &str = "CONFLICT";
 pub const UNAUTHORIZED: &str = "UNAUTHORIZED";
 pub const FORBIDDEN: &str = "FORBIDDEN";
 pub const RATE_LIMITED: &str = "RATE_LIMITED";

crates/adapters/http-axum/src/extractors/json.rs

@@ -11,10 +11,12 @@ use axum::{
 };
 use serde::de::DeserializeOwned;
 
-use crate::errors::{INVALID_INPUT, refuse};
+use crate::errors::{INTERNAL, INVALID_INPUT, refuse};
 
 /// Malformed request (bad JSON, query or path), refused as `INVALID_INPUT`.
 /// Status follows axum: 400 syntax, 415 content type, 422 data errors, 413 size.
+/// A rejection with a 5xx status is a server-side fault (e.g. a route that
+/// declares no path parameter), refused as `INTERNAL`.
 pub struct MalformedRequest {
     status: StatusCode,
     message: String,
@@ -22,7 +24,12 @@ pub struct MalformedRequest {
 
 impl IntoResponse for MalformedRequest {
     fn into_response(self) -> Response {
-        refuse(self.status, INVALID_INPUT, self.message)
+        let code = if self.status.is_server_error() {
+            INTERNAL
+        } else {
+            INVALID_INPUT
+        };
+        refuse(self.status, code, self.message)
     }
 }