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في هذا الدرس

feed the index from the source of truth without dual-write bugs.

الموضوعات المخطط لها

• The database is the source of truth; the index is rebuildable.
• Do not write the database and the index in the same request: one can fail and they diverge (dual write).
• Use events: catalog publishes ProductUpdated (outbox pattern), an indexer consumes it and upserts the document by product id; deletions as delete events.
• Use the product version as an external version so older events do not overwrite newer ones.
• Document a full reindex: new index, bulk load from the database, switch an alias, delete the old index.