Fix stuck export/upload progress caused by unindexed logs table

CHANGELOG

@@ -4,6 +4,8 @@
   - Upgraded gems:
     - rails-html-sanitizer, sqlite3, websocket-driver
   - Bugs fixes:
+    - Logs: index the logs table so progress lookups and cleanup stay fast as it grows
+    - Uploads/Exports: retry progress polling automatically after a failed request, and show an error if it keeps failing
     - [entity]:
       - [future tense verb] [bug fix]
     - Bug tracker items:

app/assets/javascripts/hera/modules/console_updater.js.coffee

@@ -1,6 +1,8 @@
 @ConsoleUpdater =
   jobId: ''
   parsing: false
+  failureCount: 0
+  maxFailures: 5
 
   updateConsole: ->
     unless ConsoleUpdater.parsing
@@ -21,4 +23,14 @@
       {item_id: ConsoleUpdater.jobId, after: after},
       null,
       'script'
-    )
+    ).done(->
+      # Reset on every success so the cap only trips on consecutive failures,
+      # not ones accumulated over the whole polling session.
+      ConsoleUpdater.failureCount = 0
+    ).fail ->
+      ConsoleUpdater.failureCount += 1
+
+      if ConsoleUpdater.failureCount < ConsoleUpdater.maxFailures
+        setTimeout(ConsoleUpdater.updateConsole, 2000)
+      else
+        $('#console').append('<p class="log text-error">Lost connection while checking progress. Please refresh the page to check the current status.</p>')

db/migrate/20260722163331_add_index_to_logs_on_uid.rb

@@ -0,0 +1,5 @@
+class AddIndexToLogsOnUid < ActiveRecord::Migration[8.0]
+  def change
+    add_index :logs, :uid
+  end
+end