V0.5.1 dev (#341)

* OpenAPI root url fix

* Journaling OSS setup

* feat: add preserve-original-file mode for email ingestion for GoBD compliance

- Add `preserveOriginalFile` option to ingestion sources and connectors
- Stream original EML/MBOX/PST emails to temp files instead of holding
  full buffers in memory, reducing memory allocation during ingestion
- Skip attachment binary extraction and EML re-serialization when
  preserve mode is enabled; use raw file on disk as source of truth
- Update `EmailObject` to use `tempFilePath` instead of in-memory `eml`
  buffer across all connectors (EML, MBOX, PST)
- Add new database migration (0032) for `preserve_original_file` column
- Add frontend UI toggle with tooltip (tippy.js) for the new option
- Replace console.warn calls with structured pino logger in connectors

* add isjournaled property to archived_email

* feat(ingestion): add unmerge ingestion source functionality

Introduces the ability to detach a child ingestion source from its
merge group, making it a standalone root source. Changes include:

- Add `unmerge` controller method with auth and error handling
- Add POST `/v1/ingestion-sources/{id}/unmerge` route with OpenAPI docs
- Implement `IngestionService.unmerge` backend logic
- Add unmerge UI action and handler in the frontend ingestion view
- Fix bulk delete to also remove children of deleted root sources
- Update docs with new API operation and merging sources user guide

* code formatting

* Database migration file for enum `partially_active`

* Error handling improvement

.env.example

@@ -104,3 +104,24 @@ ENCRYPTION_KEY=
 # Apache Tika Integration
 # ONLY active if TIKA_URL is set
 TIKA_URL=http://tika:9998
+
+
+# Enterprise features (Skip this part if you are using the open-source version)
+
+# Batch size for managing retention policy lifecycle. (This number of emails will be checked each time when retention policy scans the database. Adjust based on your system capability.)
+RETENTION_BATCH_SIZE=1000
+
+# --- SMTP Journaling (Enterprise only) ---
+# The port the embedded SMTP journaling listener binds to inside the container.
+# This is the port your MTA (Exchange, MS365, Postfix, etc.) will send journal reports to.
+# The docker-compose.yml maps this same port on the host side by default.
+SMTP_JOURNALING_PORT=2525
+# The domain used to generate routing addresses for journaling sources.
+# Each source gets a unique address like journal-<id>@<domain>.
+# Set this to the domain/subdomain whose MX record points to this server.
+SMTP_JOURNALING_DOMAIN=journal.yourdomain.com
+# Maximum number of waiting jobs in the journal queue before the SMTP listener
+# returns 4xx temporary failures (backpressure). The MTA will retry automatically.
+JOURNAL_QUEUE_BACKPRESSURE_THRESHOLD=10000
+#BullMQ worker concurrency for processing journaled emails. Increase on servers with more CPU cores.
+JOURNAL_WORKER_CONCURRENCY=3