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Michael Suchacz
1c722ff969
## Stack context Follows #27495 (merged), which gives `chat_messages.id` an append-order guarantee and moves the history reads onto it. This PR applies the same fix to the query that builds the model prompt. ## Why? `GetChatMessagesForPromptByChatID` mixed two orderings. It selected the compaction boundary with `created_at DESC, id DESC`, then applied that boundary with an `id >` comparison, and returned rows with `created_at ASC, id ASC`. `created_at` is `now()`, so it is the transaction start time. Every row in one insert batch shares it, and concurrent transactions can commit in the opposite order to the one they started in. Two consequences, both reaching the provider: - **Malformed prompts.** A tool result could be ordered ahead of the assistant message that requested it. `chatprompt.injectMissingToolResults` does not repair this: it only handles tool rows already contiguous after an assistant row, and adds missing results. It never moves a tool row that precedes its assistant, and nothing re-sorts the rows in Go. - **Wrong compaction boundary.** The boundary is picked by timestamp but compared by id, so a stale compressed summary could be retained while the actual latest one was dropped. ## Changes Both the boundary CTE and the outer query order by `id`. The `id >` predicate is unchanged, which is the point: the ordering now matches the comparison that was always being made. **The boundary index was dead, so it is rebuilt to match.** `idx_chat_messages_compressed_summary_boundary` was created for exactly this lookup, but its predicate requires `role = 'system'` while compaction writes its summary with the user role (`message_conversion.go:334`, the only writer of `compressed = true`). It matched zero rows, and no other query can use it. Migration `000560` rebuilds it as `(chat_id, id DESC) WHERE compressed AND NOT deleted AND visibility = 'model'`, which also matches the new order key. Measured on PostgreSQL 13 with a 20k-message chat, 11 summaries, and 14 sibling chats so `chat_id` is selective: | boundary lookup | plan | buffers | |---|---|---| | old predicate | Index Scan `idx_chat_messages_chat`, 19,989 rows filtered | 267 | | rebuilt index | Index Only Scan | 2 | Not in scope: the outer `SELECT` still inspects every row of the chat, because its `role = 'system' AND compressed = FALSE` disjunct has no lower `id` bound. That predates this PR and needs a query rewrite rather than an index. ## Testing Two subtests, both verified red by reverting the `ORDER BY` and regenerating: - `OrdersByIDWhenTimestampsDisagree` returned `[4,3,2,1]` instead of `[1,2,3,4]`, placing the tool result before the assistant call. - `CompactionBoundaryUsesID` selected the stale summary and leaked the messages between the two summaries into the prompt. Existing subtests pass unchanged. Migration up/down tests pass, and the rebuilt index was verified red-green: restoring the old predicate returns the plan to a 267-buffer scan, and the old predicate matches 0 rows in the fixture. > Opened by Mux on behalf of Mike.
Coder is a self-hosted platform for cloud development environments and AI coding agents. Workspaces are defined with Terraform, connected through a secure Wireguard® tunnel, and automatically shut down when not used. Coder Agents runs a native AI coding agent whose loop executes in the control plane on your infrastructure, with no API keys in workspaces.
- Define cloud development environments in Terraform
- EC2 VMs, Kubernetes Pods, Docker Containers, etc.
- Automatically shutdown idle resources to save on costs
- Onboard developers in seconds instead of days
- Delegate coding work to AI agents on your infrastructure
- Bring any model (Anthropic, OpenAI, Google, Bedrock, self-hosted)
- No LLM credentials in workspaces, user identity on every action
- Centralized model governance, cost tracking, and audit logging
Quickstart
The most convenient way to try Coder is to install it on your local machine and experiment with provisioning cloud development environments using Docker (works on Linux, macOS, and Windows).
# First, install Coder
curl -L https://coder.com/install.sh | sh
# Start the Coder server (caches data in ~/.cache/coder)
coder server
# Navigate to http://localhost:3000 to create your initial user,
# create a Docker template and provision a workspace
Install
The easiest way to install Coder is to use the
install script for Linux
and macOS. For Windows, use the latest ..._installer.exe file from GitHub
Releases.
curl -L https://coder.com/install.sh | sh
You can run the install script with --dry-run to see the commands that will be used to install without executing them. Run the install script with --help for additional flags.
See install for additional methods.
Once installed, you can start a production deployment with a single command:
# Automatically sets up an external access URL on *.try.coder.app
coder server
# Requires a PostgreSQL instance (version 13 or higher) and external access URL
coder server --postgres-url <url> --access-url <url>
Use coder --help to get a list of flags and environment variables. See the install guides for a complete tutorial.
Documentation
Browse the documentation or visit a specific section below:
- Workspaces: Workspaces contain the IDEs, dependencies, and configuration information needed for software development
- Templates: Templates are written in Terraform and describe the infrastructure for workspaces
- Coder Agents: Delegate coding work to AI agents running on your self-hosted infrastructure
- Administration: Learn how to operate Coder
- Premium: Learn about paid features built for large teams
- IDEs: Connect your existing editor to a workspace
Support
Feel free to open an issue if you have questions, run into bugs, or have a feature request.
Join our Discord to provide feedback on in-progress features and chat with the community using Coder!
Integrations
New integrations are always in progress. Open an issue to request one. Contributions are welcome in any official or community repository.
Official
- Coder Registry: Templates, modules, and integrations for common development environments
- VS Code Extension: Open any Coder workspace in VS Code with a single click
- JetBrains Toolbox Plugin: Open any Coder workspace from JetBrains Toolbox with a single click
- JetBrains Gateway Plugin: Open any Coder workspace in JetBrains Gateway with a single click
- Dev Containers: Build development environments using
devcontainer.jsonon Docker, Kubernetes, and OpenShift - Kubernetes Log Stream: Stream Kubernetes Pod events to the Coder startup logs
- Self-Hosted VS Code Extension Marketplace: A private extension marketplace that works in restricted or airgapped networks integrating with code-server.
- GitHub Actions: An action to set up the Coder CLI in GitHub workflows
Community
- Community Templates: Community-contributed workspace templates in the Coder Registry
- Community Modules: Community-contributed modules to extend Coder templates
- Provision Coder with Terraform: Provision Coder on Google GKE, Azure AKS, AWS EKS, DigitalOcean DOKS, IBMCloud K8s, OVHCloud K8s, and Scaleway K8s Kapsule with Terraform
- Coder Template GitHub Action: A GitHub Action that updates Coder templates
- Discord: Chat with the community and provide feedback on in-progress features
Contributing
New contributors are always welcome. If you are new to the Coder codebase, see the contribution guide to get started.
Hiring
Apply on the careers page if you are interested in joining the team.