Update documentation to clarity bundle_id and idempotency_key usage and distinctions

docs/consumers/api.md

@@ -11,11 +11,13 @@ The upstream application needs these values from deployment or operator configur
 - distributor endpoint: the HTTP server base URL, such as `https://distributor.example.com`;
 - upload token: bearer token for exactly one configured `http_upload` pipeline;
 - generated files: regular local files to include in the source bundle;
-- bundle id: stable identifier for this producer output;
-- idempotency key: stable key for retrying the same producer operation.
+- bundle id: stable identifier for the logical report stream or artifact;
+- idempotency key: unique key for one producer run, reused only when retrying that same run.
 
 Do not put destination routing, public URLs, transform settings, or credentials in the source manifest. Those belong in the `distributor` pipeline configuration.
 
+The bundle id and idempotency key have different jobs. The bundle id tells `distributor` whether a new upload is a newer version of the same source; keep it stable across runs that should replace the same managed destination artifact. The idempotency key tells `distributor` whether an upload request is a retry; change it for each distinct producer run so new content is enqueued.
+
 ## Recommended Workflow
 
 Use `gitea.maximumdirect.net/eric/distributor/pkg/upload`.
@@ -53,7 +55,8 @@ func SubmitReport(reportPath, summaryPath string) error {
 		return fmt.Errorf("distributor endpoint and token are required")
 	}
 
-	reportID := "weather.hourly.brentwood.2026-06-07T15"
+	reportID := "weather.hourly.brentwood"
+	runID := time.Now().UTC().Format("20060102T150405.000000000Z")
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
 
@@ -67,7 +70,7 @@ func SubmitReport(reportPath, summaryPath string) error {
 
 	result, err := client.UploadFiles(ctx, upload.UploadFilesOptions{
 		ID:             reportID,
-		IdempotencyKey: reportID,
+		IdempotencyKey: reportID + "." + runID,
 		Files: []bundle.BundleFile{
 			{SourcePath: reportPath, Path: "report.md"},
 			{SourcePath: summaryPath, Path: "summary.txt"},
@@ -88,8 +91,10 @@ func SubmitReport(reportPath, summaryPath string) error {
 
 ## Producer Responsibilities
 
-- Use a stable bundle id for the producer output, such as a report type plus logical timestamp.
-- Use a stable idempotency key for cross-process retries of the same producer operation.
+- Use a stable bundle id for the logical producer output that should replace the same destination artifact, such as `weather.hourly.brentwood`.
+- Do not include per-run timestamps, random values, or job ids in the bundle id unless each run should be treated as a different source.
+- Use an idempotency key that changes for every distinct producer run, such as `<bundle-id>.<run-id>`.
+- Reuse the same idempotency key only when retrying the exact same producer run with the same source manifest.
 - Map each generated file to a clean slash-separated bundle path, such as `report.md` or `assets/chart.png`.
 - Include only regular files. Symlinks, directories as files, devices, FIFOs, and sockets are rejected.
 - Keep file contents stable after upload inputs are selected. Bundle digests are calculated from file bytes.
@@ -99,9 +104,9 @@ Valid bundle paths are relative slash paths. They must not be empty, absolute, c
 
 ## Idempotency And Status
 
-`pkg/upload` sends `Idempotency-Key` on every upload. If the caller omits one, the package generates a random key for that call and reuses it for in-process retries. That is enough for transient network retry within one process.
+`pkg/upload` sends `Idempotency-Key` on every upload. If the caller omits one, the package generates a random key for that call and reuses it for in-process retries. That is enough for transient network retry within one process, but it does not give cross-process retry identity.
 
-For producer jobs that may retry after process restart, supply a stable key derived from the producer operation, such as the report id or job id. Reusing the same key with the same normalized source manifest returns the original accepted run. Reusing the same key with different source content returns a conflict.
+For producer jobs that may retry after process restart, supply a key derived from the producer run, such as `<bundle-id>.<run-id>`. Reusing the same key with the same normalized source manifest returns the original accepted run. Reusing the same key with different source content returns a conflict. Reusing one key across multiple distinct report generations prevents those generations from being treated as new uploads.
 
 `Status` polls `/runs/<run-id>` while the distributor server retains the in-memory status record. Status values are `accepted`, `queued`, `running`, `succeeded`, and `failed`. Completed records expire according to the server's `server.http.retention` setting, and server restart clears status and idempotency records.