barbie-bot/fixin.me
0
0
Fork 0
forked from fixin.me/fixin.me
Code Pull Requests Activity

Add index on readouts(user_id, taken_at)

Browse Source 
MeasurementsController#index orders by taken_at desc; without an index
this scan grows linearly with the readout count. The composite index
on (user_id, taken_at) covers both the implicit user_id filter from
the association scope and the ORDER BY clause.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
barbie-bot
2026-04-04 10:20:55 +00:00
parent 3702e24153
commit 862430e586
2 changed files with 2 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
db/migrate/20260402000000_add_taken_at_to_readouts.rb
View File

@@ -1,5 +1,6 @@
class AddTakenAtToReadouts < ActiveRecord::Migration[7.2] class AddTakenAtToReadouts < ActiveRecord::Migration[7.2]
def change def change
add_column :readouts, :taken_at, :datetime add_column :readouts, :taken_at, :datetime
add_index :readouts, [:user_id, :taken_at]
end end
end end

1
db/schema.rb
View File

@@ -39,6 +39,7 @@ ActiveRecord::Schema[7.2].define(version: 2026_04_03_000000) do
t.index ["quantity_id"], name: "index_readouts_on_quantity_id" t.index ["quantity_id"], name: "index_readouts_on_quantity_id"
t.index ["unit_id"], name: "index_readouts_on_unit_id" t.index ["unit_id"], name: "index_readouts_on_unit_id"
t.index ["user_id"], name: "index_readouts_on_user_id" t.index ["user_id"], name: "index_readouts_on_user_id"
t.index ["user_id", "taken_at"], name: "index_readouts_on_user_id_and_taken_at"
end end
create_table "units", charset: "utf8mb4", collation: "utf8mb4_0900_as_ci", force: :cascade do |t| create_table "units", charset: "utf8mb4", collation: "utf8mb4_0900_as_ci", force: :cascade do |t|