* Revert "Send all messages via keyspace notifications when a feature flag is enabled."
This reverts commit fadcf62166.
* Revert "Consolidate semaphore release logic."
This reverts commit c02b255766.
* Revert "Represent stored message state as an enumeration rather than a collection of booleans."
This reverts commit 89788fa665.
* Revert "Refactor: collapse state into semaphores/atomic booleans."
This reverts commit a052e2ee8f.
* Revert "Refactor: move sendNextMessagePage into its own method."
This reverts commit 158e5004b7.
* Revert "Avoid querying the database if we think all new messages are in the cache."
This reverts commit 6f9ff3be37.
* Revert "Query for more stored messages if an update happens while we're already processing a batch."
This reverts commit f766c57743.
* Revert "Only send the "queue cleared" message once per websocket session."
This reverts commit 8f53152c3e.
* Revert "Let processStoredMessages handle requery logic."
This reverts commit 7bbc88d716.
* Revert "Only allow one thread to process stored messages at a time."
This reverts commit 68256d2343.
