Month: 2026-04 — This monthly summary covers convex-backend work focused on the Write Throughput Limiter. Delivered improvements to throughput controls, fixed a critical blocking bug, clarified deployment constraints, and improved monitoring signals. The work emphasizes reliability and performance under high load, delivering business value by reducing write stalls, maintaining availability, and enabling predictable scaling.

March 2026 monthly summary for get-convex/convex-backend focusing on delivering robust indexing, reliable scheduling, and consistent naming across the codebase. Key features and bugs completed this month include index scanning improvements, backfill state unification, index build optimization, telemetry/logging, and throughput reliability fixes. The work emphasizes business value through improved data access latency, cache correctness, and greater observability while reducing unnecessary writes and avoiding regressions during scheduled mutations.

February 2026 (get-convex/convex-backend) – Concise monthly summary of deliverables, impact, and technical excellence focused on business value. 1) Key features delivered - Increase OCC backoff: raised backoff from 10ms to 100ms to reduce write conflicts and improve commit success under contention. (Commit: 8103d0b213593929a7177414366b6b34b2fcba56) - Write throughput limiter: sliding window – added a limiter that stops mutations when the committer observes more than the 16MiB per second limit within a 1s window, improving throughput predictability. (Commit: 10a872f8c2f984f3ff1ffaaee4192b4c75fc9e66) - Consolidated action limits: collapsed HTTP action limit into the v8 action limit, with accompanying docs updates for clarity (Commits: 7609ebc01a6acaf44fab4dd3ce4811f024f61b96 and 0481b7f3705a0c156c3dbb0756c8b048ff394ed5). - Observability: added log of index write bytes to monitor index write volumes (Commit: 05d14712da6b5e7d27699cf501aab56f44d24dd6). - Throughput limit enhancements and scope: applied and extended the limit to 64MiB, with retries on rate-limited errors; also extended to snapshot imports (Commits: 8310948f49ae308655895c0e5d57acc77779926e and dbc5bd6407feec2f19ab290df4458f690f0cc50e). - Performance and correctness improvements: fixed write_bytes calculation used by the throughput limit (Commit: 84e922d3b9c0605ffa9bf6e033f26e058456074d), fast-forwarded DatabaseIndexSnapshotCache initialization, and enabled index cache reuse in the scheduler (Commits: f4123722483d7a4a35cb3730c9542027a0541215 and d0d0651c585e0dad2e45783be5dce593b7c6cdee). - API and architecture improvements: introduced SearchIndex trait enhancements (DocStream associated type and IndexReader trait) for abstraction over index scans; refactored application worker handles into a dedicated struct; exposed FunctionExecutionLog API for direct access (Commits: 1337421c0787fce7319b9ae6301384443cf60609, 850e21adc84da55cf62a9ac897ac925de523cfe6, 29ee2b04064f47bba28dddf7bbec227a0cc07b8f). - Testing and reliability: added test helpers for DatabaseIndexSnapshotCache and test utilities for backfilling text indexes (Commits: 7d533fb923ab2910c1e0a0d8b0114d362a923be9 and 63be8a496f98eaf2addd44afdb42d922f3ccdda4). 2) Major bugs fixed - Write bytes calculation: corrected the write_bytes accounting to reflect actual document and index payloads; previously included RefreshableTabletUpdate noise (Commit: 84e922d3b9c0605ffa9bf6e033f26e058456074d). - Search index uniqueness: fixed bug allowing identical search fields when filter fields differ; ensures correct indexing semantics (#46893). - Throughput cap safety: lowered per-second cap for s16 and s256 to 16MiB to align with latency targets and prevent overcommits (#46969). - Minor quality: typo fix in qdrant_segments.rs to prevent confusion (#47211). 3) Overall impact and accomplishments - Built a robust and observable throughput management layer that stabilizes write latency and protects backend resources during bursts, improving service reliability and SLO adherence. - Improved index-related performance through cache fast-forwarding and reuse, reducing tombstone scans and query overhead for scheduled jobs. - Streamlined configuration and improved maintainability through API trait refinements and consolidated limits, supporting easier future evolution and cross-component consistency. - Strengthened testing utilities and code quality through refactors and targeted bug fixes, enabling faster iteration and safer deployments. 4) Technologies and skills demonstrated - Systems design: sliding window rate limiter, backoff strategy, and cache-forwarding mechanisms. - Rust and trait-based API design: DocStream, IndexReader, and modernized index traversal interfaces. - Observability and reliability: index write Byte metrics, rate-limit retry paths, and robust error handling for snapshot imports. - Refactoring and maintainability: modular worker handles, exposed APIs, comprehensive test utilities, and documentation alignment. Business value delivered: increased write reliability during contention, predictable throughput, improved observability of index operations, and maintainable architecture enabling safer scaling. Month: 2026-02

Monthly summary for 2026-01 — get-convex/convex-backend Overview: January 2026 focused on expanding observability, improving performance, and strengthening reliability across core backend subsystems. Delivered end-to-end telemetry for query usage and resource consumption, enhanced performance tracking, and refined virtual/system table accounting to support accurate cost and capacity planning. Key features delivered - Query usage analytics and resource monitoring: Added usage events for text and vector queries, capturing number of searches per index, index size, and vector dimensions; introduced disk-space usage metrics by file type for text/vector indexes to enable monitoring and resource planning; added a gauge metric to quantify searchlight archive usage by file type to better understand storage distribution across text and vector indexes. - User execution time tracking and logging enhancements: Instrumented and exposed user execution time for isolate functions; extended logging to report time spent in user code to improve performance visibility and reporting. - Virtual tables and system tables usage tracking improvements: Enhanced data modeling and usage tracking for system tables mapped to virtual tables, including secondary system tables; removed an unused text egress field; expanded tests to ensure virtual table reads/writes contribute to database bandwidth accounting and that system tables reads with associated virtual tables are correctly counted. - Indexing performance and backfilling improvements: Refactored indexing backfill flow and added indexing in backfilled state for empty tables to reduce start_push latency; targeted optimizations across database, text, and vector indexes to improve indexing efficiency and state management. - Subscription management enhancements and improved concurrency UX: Introduced a system subscription invalidation lag metric; adjusted flow to subscribe_and_wait_for_invalidation to improve determinism; skipped splaying for system subscriptions to reduce noise under heavy load; surfaced user-friendly messaging when maximum concurrency is exceeded. Major bugs fixed - Corrected usage tracking for secondary system tables to ensure accurate virtual table usage counts, aligning with the primary/secondary mapping model and improving bandwidth accounting. - Minor refactor cleanups and naming alignments to improve clarity (e.g., aligning search-related function names with behavior). Overall impact and accomplishments - Improved observability and cost planning with granular per-index usage, disk-space by file type, and virtual/system table bandwidth accounting. - Better performance visibility and faster issue diagnosis through user execution time reporting and enhanced logging. - More reliable indexing/backfilling behavior, reducing start-up latency and improving indexing throughput across database, text, and vector indexes. - Better reliability and UX under contention with clearer concurrency error messaging and improved system subscription handling. Technologies/skills demonstrated - Telemetry instrumentation and metrics (usage events, gauges, bandwidth accounting) - Performance tracing and logging (user execution time, isolate functions) - Data modeling for virtual and secondary system tables - Indexing and backfilling optimization across database/text/vector indexes - Test coverage expansion for bandwidth accounting and system-table interactions Representative commits (PRs) - 72358502a35fe19d3409023edebf309de82afcdd - 272e7f4d46f0a9189d6e167f39f07d152b409fed - d13a02ecae088fe7cc91840d8cd1155dcce5c03b - 08328f60ea17d97c22422fd8f9603f9fda73f523 - 5701037d95f2a7cc46189df2b4915bf8ed81569b

December 2025 monthly work summary focusing on reliability, performance, and governance improvements across convex-backend. Delivered major scheduling system enhancements, robust tablet lifecycle management, and expanded observability. The work reduces operational risk, improves data accessibility for run-time operations, and enables better analytics for capacity planning and debugging.

Summary for 2025-11: Delivered two stability-focused enhancements in convex-backend, with changes fully managed via centralized knob-based configuration. 1) MySQL timeout alignment with Vitess to reduce connection issues by setting a 19s timeout (slightly below Vitess 20s), implemented in the common knobs file. Commit: 9ccd8a018fc2e2ab12670954ac513af1943061de. 2) Throttle upstream HTTP requests to protect upstream services by lowering the maximum concurrent requests from 20 to 15, implemented in knobs.rs. Commit: 09ae71f0f014f8a2f155edc59706c92c1a945f8a. These changes reduce operational risk and improve reliability, with configuration centralized for easier future tuning.

October 2025 performance summary for get-convex/convex-backend: Delivered reliability and throughput improvements through a new upstream saturation TTL knob, hardened and resumable index backfill, and stabilized timeout semantics for concurrency permits. These changes improve load-balancing decisions under saturated upstreams, ensure index backfills are robust and resumable, and provide predictable failure modes for throughput-bound workloads. Close collaboration with back-end teams and solid test coverage underpinned these deployments, driving measurable business value in latency and data availability.

September 2025 (2025-09) highlights focused on strengthening schema validation visibility, reliability, and observability in convex-backend, while hardening deployment and persistence reliability and expanding monitoring. Delivered key features for schema validation progress, improved UDF error handling, and richer telemetry, complemented by segment-level backfill tracking and targeted fixes to stability and deployment workflows.

August 2025: Delivered significant progress on staged index lifecycle, observability, and safety for convex-backend, with strong emphasis on business value, reliability, and maintainability. The release includes feature work to enable staged (pre-activation) indexes for databases, text indexes, and vector indexes, along with UI and system-table support to improve observability and prep for schema evolution without impacting live data. Fixed robustness around JSON serialization for numeric edge cases, reducing downtime risk and improving API reliability.

July 2025 monthly summary for convex-backend and chef repositories. Focused on delivering resilient backfill infrastructure, improved observability, and production tooling, while expanding deployment capabilities. The work emphasizes business value: faster backfills, clearer progress signals, and more reliable dashboards and deployments.

June 2025 highlights substantial product and platform improvements across get-convex/chef and convex-backend, focused on user experience, data integrity, and reliability. Key user-facing work included Prompt System Enhancements (full-text search in Notion clone and extended system prompts) and Presence/Admin UI Enhancements (presence highlighting and admin share links), complemented by automated maintenance with Debug File Maintenance and data hygiene through Storage/Migration housekeeping. Data integrity improvements in Chat History and Snapshots Handling prevent unintended deletions and ensure correct snapshot behavior when sharing. Backend reliability was strengthened via configurable search backoffs, improved AWS Lambda argument handling, and vector memory tracking adjustments, along with Toolcall system improvements (environment variable support and safer messaging). Documentation updates (ProseMirror docs) and governance changes (typeahead docs) progressed, and schema hardening for social sharing (snapshotId and IDs) completed. Note: a rewind threshold policy was introduced and later reverted to minimize disruption.

May 2025 — Key features and improvements across get-convex/chef and convex-backend. Key features delivered include relevant-files handling improvements (including including relevant files in user messages, context-aware sending, and alignment with message cutoff and serialization handling); chat lifecycle enhancements (soft-deletes, migrations for isDeleted, and chat renaming fixes); message collapse enhancements (metrics and algorithm improvements); and collaborative editing improvements (collaborative text editing component and ProseMirror prompt simplification). Major bugs fixed include caching reliability fixes (avoid caching tool definitions, system messages, and relevant files), prosemirror prompt issues and rerender workaround, and collapse handling edge-cases (same partIndex). The overall impact is improved reliability and correctness of messaging, better user experience around relevant-file content and chat management, and enhanced observability and collaboration capabilities. Technologies/skills demonstrated include advanced caching strategies and metrics instrumentation (Gemini/OpenAI), serialization awareness, chat migrations, ProseMirror/editor tooling, and feature-flag governance.

April 2025 monthly summary for get-convex/chef focused on reliability, performance, and developer velocity. Delivered key features for chat snapshot handling, code quality tooling, UX refinements, and robust data migrations/storage integrity, complemented by performance optimizations and enhanced dev workflow.

March 2025 monthly summary: Delivered core backend performance and reliability enhancements for the get-convex/convex-backend, enabling a persistent node executor server, robust temporary resource cleanup, and a faster self-hosted startup path; introduced Cloudflare R2 compatibility with S3-like behavior and updated self-hosted docs to guide R2 configurations; expanded observability with new metrics, traces, and timing instrumentation, plus a targeted performance optimization to snapshot calculations. Fixed a bug by removing unnecessary event tracing in UDF execution, reducing runtime noise and improving stability. Simplified code paths by removing the fuzzy search knob and simplifying QueryTerm, reducing dead code and maintenance burden. Enhanced onboarding and developer experience with improved Clerk auth token docs, LoadGenerator usage guidance, and deployment onboarding clarity. In the chef repo, upgraded Webcontainer API to 1.5.1 to strengthen export API reliability (pnpm-lock.yaml updated). These changes collectively improve reliability, performance, and developer productivity, delivering tangible business value for self-hosted deployments and broader storage interoperability.

February 2025 — Delivered deployment reliability enhancements, expanded self-hosting capabilities, and tightened security and OSS contributions for convex-backend. Key outcomes include runtime deployment URL resolution with trailing slash tolerance and a corrected dashboard Dockerfile, updated Fly tooling/docs with a subdirectory migration and reduced dashboard resource usage, and Dockerfile reorganization moving instructions into a docker/ directory with a fixed backend build. Self-hosting guidance for Neon Postgres and updated docs (including docker usage) ease customer self-hosting. A new environment-variable-based beacon/log redaction option gives operators data-control capabilities. Concurrently, critical bug fixes improved PostgreSQL compatibility (run_backend.sh), reduced local node-executor disk usage, and ensured TLS certificate verification with MySQL, plus a self-hosted dashboard copy-key fix. These changes drive faster, more reliable deployments, lower operating costs, and broader self-hosting support.

January 2025 performance summary focusing on delivering high-impact features, improving reliability, and enhancing observability. Highlights include configurable fuzzy search, improved out-of-memory detection/reporting with Sentry integration, enhanced commit tracing and latency metrics, Docker-based self-hosted deployment with a dashboard, and expanded tracing for MySQL writes. These efforts reduce latency, improve debugging, and streamline deployment for operators across convex-backend.

December 2024 (get-convex/convex-backend) delivered substantial reliability, performance, and configurability gains that directly translate to business value. Key outcomes include a robust retry flow for node analyze operations, safer concurrency controls for Big-Brain instance claims, and broad memory/performance optimizations across hot paths. The work also added configurable search behaviors and strengthened error handling and observability, enabling faster issue diagnosis and better user experience under load.

This month focused on delivering targeted deployments, simplifying the analyzed data model, consolidating the runtime execution path, and enhancing observability and performance. Key changes reduce deployment risk, improve data integrity, and provide better performance visibility for ongoing optimization.