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Guides 25–48 of 348
Troubleshooting guide
Django bulk import saves rows but misses business updates: inspect bypassed hooks
Compare bulk writes with ordinary model saves before replaying an import whose derived fields or internal audit records did not update.
Troubleshooting guide
Django daily report misses late orders: define the reporting day and time zone
Distinguish an instant in UTC from a buyer's local calendar day and test midnight and daylight-saving boundaries before changing report totals.
Troubleshooting guide
Django totals differ by a penny: trace decimal precision and rounding policy
Separate decimal storage, input conversion and line-versus-total rounding before applying a format-only fix to a business calculation.
Troubleshooting guide
Django CSV export has shifted columns or missing rows: check serialization and completion
Use a real CSV parser and a known synthetic record set to distinguish quoting errors from incomplete large-response delivery.
Troubleshooting guide
Django report pages repeat or skip records: make ordering and change policy explicit
Test tied sort values separately from concurrent inserts so a stable tie-breaker is not mistaken for a snapshot-consistent export.
Troubleshooting guide
Next.js deployment blocked by a type error: fix the contract, not the check
Distinguish a genuine TypeScript mismatch from different build configurations and retain a production type check when repairing a failed deployment.
Troubleshooting guide
Next.js build killed for memory: identify the phase before changing limits
Separate a heap exhaustion or container kill from a compiler error, and collect bounded build evidence without exposing a debugger or disabling safety checks.
Troubleshooting guide
Next.js remote image fails while its source URL works: check the optimizer boundary
Separate an image-host allowlist mismatch from private-source authentication and preserve narrow image permissions instead of allowing every remote host.
Troubleshooting guide
Next.js navigation breaks during a rolling release: compare deployment versions
Diagnose old browser assets reaching a new server separately from stale business data, and test both navigation and unsaved-state behaviour.
Troubleshooting guide
A Next.js update appears on one server but not another: trace shared invalidation
Distinguish per-instance cached business data from browser or CDN staleness, and define a cross-instance update test before changing cache storage.
Troubleshooting guide
One Sheets row becomes one Xero invoice line: check the line-item shape
Distinguish missing spreadsheet headers from multiple products mapped into one invoice line, using a disposable two-product acceptance case.
Troubleshooting guide
Restore a custom product tab after a Shopify theme update
Compare the updated draft with the previous theme and distinguish editor settings from incompatible custom code.
Troubleshooting guide
Uninstalled a Shopify review app? Check code, data and billing separately
Remove a leftover storefront widget without assuming app removal preserved reviews or ended an external subscription.
Troubleshooting guide
Undefined function mysql_connect: why a simple rename is not a database repair
Recognise a removed PHP extension and plan a tested migration of connection, query and result handling.
Troubleshooting guide
PHP 7 to PHP 8: test changed behaviour, not just syntax
Use the official incompatibility notes to target comparisons, exceptions and critical business flows on an isolated copy.
Troubleshooting guide
Laravel emails stopped sending: distinguish queue, worker and mail delivery failures
Inspect the job boundary before restarting workers or retrying messages that may already have been sent.
Troubleshooting guide
Plan a Django upgrade in testable steps
Use release notes, deprecation warnings and dependency compatibility to avoid an unreviewable jump from a legacy application.
Troubleshooting guide
Next.js works locally but fails on Vercel: compare production builds first
Separate development-server success, build errors and pre-build provider failures using the same revision and configuration.
Troubleshooting guide
Move DNS without forgetting email, verification records or DNSSEC
Inventory the full zone, compare the destination and plan nameserver changes with the account holder instead of copying only the website record.
Troubleshooting guide
SPF, DKIM and DMARC: fix authentication without promising inbox placement
Identify legitimate senders, inspect alignment and separate authentication from delivery reputation and filtering.
Troubleshooting guide
Changed a Next.js environment variable but the browser still uses the old value?
Check build-time public configuration before rebuilding or exposing a private variable to the browser as a shortcut.
Troubleshooting guide
Find the first useful error in a failed GitHub Actions run
Turn a final exit code into a bounded failure report without rerunning a deployment or sharing private logs.
Troubleshooting guide
Why tests pass locally but fail in GitHub Actions
Compare runtime, revision, dependencies and privilege context before blaming the runner or weakening your tests.
Troubleshooting guide
Stripe webhook not updating your app? Separate delivery from processing
Check the destination response, raw-body signature verification and durable processing before replaying payment events.
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