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659d130f3b
Previously, attachment deduplication was handled globally by enforcing a unique constraint on the content hash (contentHashSha256) in the `attachments` table. This caused an issue where an attachment from one ingestion source would be incorrectly linked if the same attachment was processed by a different source. This commit refactors the deduplication logic to be scoped on a per-ingestion-source basis. Changes: - **Schema:** The `attachments` table schema has been updated to include a nullable `ingestionSourceId` column. A composite unique index has been added on `(ingestionSourceId, contentHashSha256)` to enforce per-source uniqueness. The `ingestionSourceId` is nullable to ensure backward compatibility with existing databases. - **Ingestion Logic:** The `IngestionService` has been updated to provide the `ingestionSourceId` when inserting attachment records. The `onConflictDoUpdate` clause now targets the new composite key, ensuring that attachments are only considered duplicates if they have the same hash and originate from the same ingestion source.