fix(sqlite): Empty the cache after the introduction of TimelineEvent::timestamp.

After the merge of
https://github.com/matrix-org/matrix-rust-sdk/pull/5648, we want
all events to get a `TimelineEvent::timestamp` value (extracted from
`origin_server_ts`).

To accomplish that, we are emptying the event cache. New synced events
will be built correctly, with a valid `TimelineEvent::timestamp`,
allowing a clear, stable situation.

crates/matrix-sdk-sqlite/migrations/event_cache_store/011_empty_event_cache.sql

@@ -0,0 +1,12 @@
+-- After the merge of https://github.com/matrix-org/matrix-rust-sdk/pull/5648,
+-- we want all events to get a `TimelineEvent::timestamp` value (extracted from
+-- `origin_server_ts`).
+--
+-- To accomplish that, we are emptying the event cache. New synced events will
+-- be built correctly, with a valid `TimelineEvent::timestamp`, allowing a
+-- clear, stable situation.
+
+DELETE from linked_chunks;
+DELETE from event_chunks; -- should be done by cascading
+DELETE from gap_chunks; -- should be done by cascading
+DELETE from events;

crates/matrix-sdk-sqlite/src/event_cache_store.rs

@@ -63,7 +63,7 @@ const DATABASE_NAME: &str = "matrix-sdk-event-cache.sqlite3";
 /// This is used to figure whether the SQLite database requires a migration.
 /// Every new SQL migration should imply a bump of this number, and changes in
 /// the [`run_migrations`] function.
-const DATABASE_VERSION: u8 = 10;
+const DATABASE_VERSION: u8 = 11;
 
 /// The string used to identify a chunk of type events, in the `type` field in
 /// the database.
@@ -453,6 +453,16 @@ async fn run_migrations(conn: &SqliteAsyncConn, version: u8) -> Result<()> {
         }
     }
 
+    if version < 11 {
+        conn.with_transaction(|txn| {
+            txn.execute_batch(include_str!(
+                "../migrations/event_cache_store/011_empty_event_cache.sql"
+            ))?;
+            txn.set_db_version(11)
+        })
+        .await?;
+    }
+
     Ok(())
 }