milestone 18: collapse duplicated infrastructure into shared listener core, crud list helper, resource shells, transport race, name and line helpers, ui modules

src/web/handlers/settings.zig

@@ -281,10 +281,7 @@ pub fn applyPut(
     arena: Allocator,
     patch: Patch,
 ) error{OutOfMemory}!union(enum) { config: model.Config, fail: Failure } {
-    const database = switch (mutations.configDb(state)) {
-        .database => |value| value,
-        .fail => |failure| return .{ .fail = failure },
-    };
+    const database = mutations.requireConfigDb(state) catch return .{ .fail = mutations.no_config_db };
 
     // Ruling 18 of milestone 16: argon2id at m=19 MiB is the longest thing this
     // handler does, and its input is the parsed patch alone — nothing under the
@@ -449,10 +446,8 @@ pub const hash_stall_control = if (builtin.is_test) struct {
 // ---------------------------------------------------------------------------
 
 pub fn get(state: *server.WebState, io: std.Io, request: *Request) HandlerError!void {
-    const database = switch (mutations.configDb(state)) {
-        .database => |value| value,
-        .fail => |failure| return mutations.respondFailure(request, failure, "reading the settings"),
-    };
+    const database = mutations.requireConfigDb(state) catch
+        return mutations.respondFailure(request, mutations.no_config_db, "reading the settings");
 
     // Under the same lock the mutation handlers hold: a PUT rewrites every
     // settings row in one transaction on this shared connection, and SQLite's