From 0dabf7476e795be1b8515416e455acf1a1c6b91d Mon Sep 17 00:00:00 2001
From: Noah del Angel <noahdelangel@gmail.com>
Date: Mon, 27 Jul 2026 22:08:54 -0500
Subject: [PATCH] perf: Postgres storage tuning for app_attest hot tables

Reduce bloat on the three high-churn tables in the app_attest database.

- challenges: lower autovacuum_vacuum_scale_factor 0.2 -> 0.05 and raise
    autovacuum_vacuum_cost_limit to 2000, so autovacuum reclaims the dead
    rows from the per-request insert+delete churn sooner and faster.
- public_keys: set fillfactor=85 (plus scale_factor 0.05) so the per-request
    counter/updated_at UPDATEs stay hot
- mlpa_user_capacity: set fillfactor=70 and raise the autovacuum threshold
    to 1000 (scale_factor 0) so the single hot row's updates stay HOT on one
    page and we stop over-vacuuming a one-row table
---
 ..._tune_autovacuum_and_fillfactor_on_app_.py | 71 +++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 alembic/versions/b3ea148a6d0b_tune_autovacuum_and_fillfactor_on_app_.py

diff --git a/alembic/versions/b3ea148a6d0b_tune_autovacuum_and_fillfactor_on_app_.py b/alembic/versions/b3ea148a6d0b_tune_autovacuum_and_fillfactor_on_app_.py
new file mode 100644
index 00000000..de18aaa2
--- /dev/null
+++ b/alembic/versions/b3ea148a6d0b_tune_autovacuum_and_fillfactor_on_app_.py
@@ -0,0 +1,71 @@
+"""Postgres storage tuning for app_attest hot tables
+
+Revision ID: b3ea148a6d0b
+Revises: 919c4d382c42
+Create Date: 2026-07-27
+
+"""
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "b3ea148a6d0b"
+down_revision = "919c4d382c42"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute(
+        """
+        ALTER TABLE challenges SET (
+            autovacuum_vacuum_scale_factor = 0.05,
+            autovacuum_vacuum_cost_limit = 2000
+        )
+        """
+    )
+    op.execute(
+        """
+        ALTER TABLE public_keys SET (
+            fillfactor = 85,
+            autovacuum_vacuum_scale_factor = 0.05
+        )
+        """
+    )
+    op.execute(
+        """
+        ALTER TABLE mlpa_user_capacity SET (
+            fillfactor = 70,
+            autovacuum_vacuum_scale_factor = 0.0,
+            autovacuum_vacuum_threshold = 1000
+        )
+        """
+    )
+
+
+def downgrade() -> None:
+    op.execute(
+        """
+        ALTER TABLE mlpa_user_capacity RESET (
+            fillfactor,
+            autovacuum_vacuum_scale_factor,
+            autovacuum_vacuum_threshold
+        )
+        """
+    )
+    op.execute(
+        """
+        ALTER TABLE public_keys RESET (
+            fillfactor,
+            autovacuum_vacuum_scale_factor
+        )
+        """
+    )
+    op.execute(
+        """
+        ALTER TABLE challenges RESET (
+            autovacuum_vacuum_scale_factor,
+            autovacuum_vacuum_cost_limit
+        )
+        """
+    )