fleet/server
Victor Lyuboslavsky 8af94af14b
Removed duplicate FlippingPoliciesForHost DB calls (#42845)
<!-- Add the related story/sub-task/bug number, like Resolves #123, or
remove if NA -->
**Related issue:** Resolves #42836 

This is another hot path optimization.

## Before

When a host submits policy results via `SubmitDistributedQueryResults`,
the system needed to determine which policies "flipped" (changed from
passing to failing or vice versa). Each consumer computed this
independently:

```
SubmitDistributedQueryResults(policyResults)
  |
  +-- processScriptsForNewlyFailingPolicies
  |     filter to failing policies with scripts
  |     BUILD SUBSET of results
  |     CALL FlippingPoliciesForHost(subset)          <-- DB query #1
  |     convert result to set, filter, queue scripts
  |
  +-- processSoftwareForNewlyFailingPolicies
  |     filter to failing policies with installers
  |     BUILD SUBSET of results
  |     CALL FlippingPoliciesForHost(subset)          <-- DB query #2
  |     convert result to set, filter, queue installs
  |
  +-- processVPPForNewlyFailingPolicies
  |     filter to failing policies with VPP apps
  |     BUILD SUBSET of results
  |     CALL FlippingPoliciesForHost(subset)          <-- DB query #3
  |     convert result to set, filter, queue VPP
  |
  +-- webhook filtering
  |     filter to webhook-enabled policies
  |     CALL FlippingPoliciesForHost(subset)          <-- DB query #4
  |     register flipped policies in Redis
  |
  +-- RecordPolicyQueryExecutions
        CALL FlippingPoliciesForHost(all results)     <-- DB query #5
        reset attempt counters for newly passing
        INSERT/UPDATE policy_membership
```

Each `FlippingPoliciesForHost` call runs `SELECT policy_id, passes FROM
policy_membership WHERE host_id = ? AND policy_id IN (?)`. All 5 queries
hit the same table for the same host before `policy_membership` is
updated, so they all see identical state.

Each consumer also built intermediate maps to narrow down to its subset
before calling `FlippingPoliciesForHost`, then converted the result into
yet another set for filtering. This meant 3-4 temporary maps per
consumer.

## After

```
SubmitDistributedQueryResults(policyResults)
  |
  CALL FlippingPoliciesForHost(all results)           <-- single DB query
  build newFailingSet, normalize newPassing
  |
  +-- processScriptsForNewlyFailingPolicies
  |     filter to failing policies with scripts
  |     CHECK newFailingSet (in-memory map lookup)
  |     queue scripts
  |
  +-- processSoftwareForNewlyFailingPolicies
  |     filter to failing policies with installers
  |     CHECK newFailingSet (in-memory map lookup)
  |     queue installs
  |
  +-- processVPPForNewlyFailingPolicies
  |     filter to failing policies with VPP apps
  |     CHECK newFailingSet (in-memory map lookup)
  |     queue VPP
  |
  +-- webhook filtering
  |     filter to webhook-enabled policies
  |     FILTER newFailing/newPassing by policy IDs (in-memory)
  |     register flipped policies in Redis
  |
  +-- RecordPolicyQueryExecutions
        USE pre-computed newPassing (skip DB query)
        reset attempt counters for newly passing
        INSERT/UPDATE policy_membership
```

The intermediate subset maps and per-consumer set conversions are
removed. Each process function goes directly from "policies with
associated automation" to "is this policy in newFailingSet?" in a single
map lookup.

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.

## Testing

- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Performance Improvements**
* Reduced redundant database queries during policy result submissions by
computing flipping policies once per host check-in instead of multiple
times.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->
2026-04-06 10:11:07 -05:00
..
acl ACME MDM -> main (#42926) 2026-04-02 15:56:31 -05:00
activity Removed the ptr helper package from Activity bounded context (#42161) 2026-03-23 14:10:07 -05:00
archtest Refactor endpoint_utils for modularization (#36484) 2025-12-31 09:12:00 -06:00
authz Fixed team maintainers, admins, and GitOps users being unable to add certificate templates (#41740) 2026-03-16 12:24:31 -05:00
aws_common Feat 1817 add iam auth to mysql and redis (#32488) 2025-09-04 10:08:47 -05:00
bindata Allow users to be readded if they were ever removed (#1945) 2021-09-07 13:33:40 -03:00
config Skip startup library for primo mode (#43019) 2026-04-05 21:36:56 -05:00
contexts Move PostJSONWithTimeout to platform/http package and activity cleanup (#40561) 2026-02-26 17:39:10 -06:00
cron slog migration: initLogger + serve.go + cron + schedule (#40699) 2026-02-27 14:29:27 -06:00
crypto Crypto package for db encryption (#41139) 2026-03-11 16:45:59 -06:00
datastore Removed duplicate FlippingPoliciesForHost DB calls (#42845) 2026-04-06 10:11:07 -05:00
dev_mode Add lock semantics around dev_mode.IsEnabled to avoid data races (#42646) 2026-03-31 07:49:45 -04:00
errorstore Incremental migration to slog (#40120) 2026-02-19 15:35:35 -06:00
fleet Removed duplicate FlippingPoliciesForHost DB calls (#42845) 2026-04-06 10:11:07 -05:00
goose Use UTC timestamps for DB migrations (#36228) 2025-11-24 15:49:10 -06:00
health slog migration: service layer + subsystem libraries (#40661) 2026-02-26 17:40:46 -06:00
launcher Final slog migration PR: test infrastructure + tools + remaining standalone files (#40727) 2026-02-28 05:52:21 -06:00
live_query Incremental migration to slog (#40120) 2026-02-19 15:35:35 -06:00
logging Migrated logging and google calendar files to use slog (#40541) 2026-02-26 12:48:54 -06:00
mail Run multiple independent Fleet dev servers in parallel (#41865) 2026-03-18 13:58:58 -05:00
mdm Switch FMA manifest retrieval to use Cloudflare R2 bucket (#43012) 2026-04-03 19:08:45 -05:00
mock Removed duplicate FlippingPoliciesForHost DB calls (#42845) 2026-04-06 10:11:07 -05:00
platform ACME MDM -> main (#42926) 2026-04-02 15:56:31 -05:00
policies Migrating maintained apps, failing policies, and webhooks to slog. (#40149) 2026-02-23 08:50:40 -06:00
ptr speed up macOS profile delivery for initial enrollments (#41960) 2026-03-19 14:58:10 -05:00
pubsub Incremental migration to slog (#40120) 2026-02-19 15:35:35 -06:00
service Removed duplicate FlippingPoliciesForHost DB calls (#42845) 2026-04-06 10:11:07 -05:00
shellquote Updating golangci-lint to 1.61.0 (#22973) 2024-10-18 12:38:26 -05:00
sso End-user authentication for Window/Linux setup experience: backend (#34835) 2025-10-31 11:16:42 -05:00
test Move NewActivity to activity bounded context (#39521) 2026-02-25 14:11:03 -06:00
variables DCSW: Support all IDP variables in Windows config profiles (#34707) 2025-10-24 10:10:58 -03:00
version Move external dependency fleetdm/kolide-kit to monorepo (#15861) 2024-01-02 18:22:52 -03:00
vulnerabilities Use OSV for ubuntu vulnerability scanning (#42063) 2026-04-03 15:59:32 -05:00
webhooks Feat/31914 patch policy (#41518) 2026-03-13 16:47:09 -04:00
websocket Enable errcheck linter for golangci-lint (#8899) 2022-12-05 16:50:49 -06:00
worker use redis to block double profile work for apple devices setting up (#42421) 2026-03-30 16:37:18 -05:00
utils.go Move PostJSONWithTimeout to platform/http package and activity cleanup (#40561) 2026-02-26 17:39:10 -06:00
utils_test.go feature: target profiles by labels (#16202) 2024-01-26 11:00:58 -05:00