docs: remove references to SQS (#18268)

Author: miketheman

docs/dev/architecture.md

@@ -90,15 +90,13 @@ C4Container
   Container_Boundary(c1, "Warehouse & Supporting Systems") {
     Container(camo, "Camo", "image proxy")
     Container(web_app, "Web", "Python (Pyramid, SQLAlchemy)", "Delivers HTML and API content")
-    SystemQueue(sqs, "AWS SQS", "task broker")
     SystemDb(opensearch, "OpenSearch", "Index of projects, packages, metadata")
     SystemDb(db, "Postgres Database", "Store project, package metadata, user details")
     SystemDb(redis, "Redis", "Store short-term cache data")
 
-    Rel(web_app, sqs, "queue tasks")
     Rel(web_app, opensearch, "search for projects")
     Rel(web_app, db, "store/retrieve most data")
-    Rel(web_app, redis, "cache data")
+    Rel(web_app, redis, "cache data & task queue")
   }
 
   Rel(endUser, camo, "load images from project descriptions", "HTTPS")
@@ -126,10 +124,7 @@ C4Container
     System(s3, "AWS S3", "Object store (archive)")
     Rel(web_app, s3, "stores package files")
 
-    SystemQueue(sqs, "AWS SQS", "task broker")
-    Rel(web_app, sqs, "queue sync to cache task")
-
-    SystemDb(redis, "Redis", "Store short-term cache data")
+    SystemDb(redis, "Redis", "Store short-term cache data, task broker")
     Rel(web_app, redis, "get/set rate limits and cache data")
   }
 
@@ -142,7 +137,7 @@ Our workers use Celery to run tasks.
 We run a single worker type, feeding off multiple queues.
 We also use Celery Beat to schedule tasks.
 
-We currently use AWS SQS as the queue,
+We currently use Redis as the queue,
 and Redis as the result backend and schedule storage.
 
 ```{mermaid}
@@ -152,21 +147,19 @@ C4Container
 
   Container_Boundary(c1, "Supporting Systems") {
     SystemDb(redis, "Redis", "Store short-term cache data")
-    SystemQueue(sqs, "AWS SQS", "task broker")
     SystemDb(opensearch, "OpenSearch", "Index of projects, packages, metadata")
     SystemDb(db, "Postgres Database", "Store project, package metadata, user details")
     System(ses, "AWS SES", "Simple Email Service")
   }
 
   System_Ext(fastly, "Fastly", "Content Delivery Network")
 
-  BiRel(worker, sqs, "get next task/ack")
-  BiRel(worker, redis, "store task results")
+  BiRel(worker, redis, "get next task/ack")
   BiRel(worker, db, "interact with models")
   BiRel(worker, opensearch, "update search index")
   Rel(worker, fastly, "purge URLs")
   Rel(worker, ses, "send emails")
 
   BiRel(worker_beat, redis, "fetch/store task schedules")
-  Rel(worker_beat, sqs, "schedule tasks")
+  Rel(worker_beat, redis, "schedule tasks")
 ```