Fix N + 1 queries and introduce Prosopite gem

[nicklathe]

• Use Claude to surface existing N + 1 queires
• Install Prosopite gem in dev and test group to catch other/new N + 1 queires

Benchmark Results

Query counts measured with ActiveSupport::Notifications on sql.active_record, median of 3 runs per scenario. Each scenario runs the same code path twice — once without includes (before) and once with the eager loading fix (after) — against a local dev database.

Sample Between Using 'includes'

------------------------------------------------------------------------------
Scenario                                   Before    After    Saved Records
------------------------------------------------------------------------------
SectionInstructors#index                       11        3      73% (5 records)
Unit#with_seed_models                          82       21      74% (20 records)
CurriculumPdfs#get_pdf_enabled_scripts         51        3      94% (50 records)
LTI#section_instructors                         5        3      40% (4 records)
------------------------------------------------------------------------------
TOTAL                                         149       30      80%

80% total query reduction across benchmarked scenarios. Improvements scale linearly with record count — production workloads with larger result sets will see proportionally larger gains.

Diff Between Active Record Calls in development.log

Grep'ing the development.log after 3 refreshes of page, comparing before (staging) and after (feature branch) of total accumulated Active Record times:

Before Change
Started GET "/teacher_dashboard/home" resulted in a median Active Record time of 893 ms

After Change
Started GET "/teacher_dashboard/home" resulted in a median Active Record time of 179 ms

Links

• Jira:

Testing story

Deployment notes

Privacy and security