Import bulk of code from River UI project

.github/workflows/ci.yaml

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+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build_and_test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          check-latest: true
+          go-version-file: "go.mod"
+
+      - name: Display Go version
+        run: go version
+
+      - name: Test
+        run: make test
+
+  golangci-lint:
+    runs-on: ubuntu-latest
+    env:
+      GOLANGCI_LINT_VERSION: v1.64.6
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          check-latest: true
+          go-version-file: "go.mod"
+
+      - name: Lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: ${{ env.GOLANGCI_LINT_VERSION }}

.golangci.yaml

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+issues:
+  exclude:
+    - 'Error return value of .(\w+\.Rollback(.*)). is not checked'
+
+linters:
+  presets:
+    - bugs
+    - comment
+    - format
+    - performance
+    - style
+    - test
+    - unused
+
+  disable:
+    # disabled, but which we should enable with discussion
+    - wrapcheck # checks that errors are wrapped; currently not done anywhere
+
+    # disabled because we're not compliant, but which we should think about
+    - exhaustruct # checks that properties in structs are exhaustively defined; may be a good idea
+    - testpackage # requires tests in test packages like `river_test`
+
+    # disabled because they're annoying/bad
+    - interfacebloat # we do in fact want >10 methods on the Adapter interface or wherever we see fit.
+    - godox # bans TODO statements; total non-starter at the moment
+    - err113 # wants all errors to be defined as variables at the package level; quite obnoxious
+    - mnd # detects "magic numbers", which it defines as any number; annoying
+    - ireturn # bans returning interfaces; questionable as is, but also buggy as hell; very, very annoying
+    - lll # restricts maximum line length; annoying
+    - nlreturn # requires a blank line before returns; annoying
+    - wsl # a bunch of style/whitespace stuff; annoying
+
+linters-settings:
+  depguard:
+    rules:
+      all:
+        files: ["$all"]
+        deny:
+          - desc: "Use `github.com/google/uuid` package for UUIDs instead."
+            pkg: "github.com/xtgo/uuid"
+
+  forbidigo:
+    forbid:
+      - msg: "Use `require` variants instead."
+        p: '^assert\.'
+      - msg: "Use `Func` suffix for function variables instead."
+        p: 'Fn\b'
+      - msg: "Use built-in `max` function instead."
+        p: '\bmath\.Max\b'
+      - msg: "Use built-in `min` function instead."
+        p: '\bmath\.Min\b'
+
+  gci:
+    sections:
+      - Standard
+      - Default
+      - Prefix(github.com/riverqueue)
+
+  gomoddirectives:
+    replace-local: true
+
+  gosec:
+    excludes:
+      - G404 # use of non-crypto random; overly broad for our use case
+
+  revive:
+    rules:
+      - name: unused-parameter
+        disabled: true
+
+  tagliatelle:
+    case:
+      rules:
+        json: snake
+
+  testifylint:
+    enable-all: true
+    disable:
+      - go-require
+
+  varnamelen:
+    ignore-names:
+      - db
+      - eg
+      - f
+      - i
+      - id
+      - j
+      - mu
+      - r
+      - sb # common convention for string builder
+      - t
+      - tt # common convention for table tests
+      - tx
+      - w
+      - wg

LICENSE.txt

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+Copyright 2025 Blake Gentry, Brandur Leach
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Makefile

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+.DEFAULT_GOAL := help
+
+# Looks at comments using ## on targets and uses them to produce a help output.
+.PHONY: help
+help: ALIGN=22
+help: ## Print this message
+	@awk -F '::? .*## ' -- "/^[^':]+::? .*## /"' { printf "'$$(tput bold)'%-$(ALIGN)s'$$(tput sgr0)' %s\n", $$1, $$2 }' $(MAKEFILE_LIST)
+
+.PHONY: lint
+lint:: ## Run linter
+	golangci-lint run --fix
+
+.PHONY: test
+test:: ## Run test suite
+	go test ./...
+
+.PHONY: test/race
+test/race:: ## Run test suite with race detector
+	go test ./... -race
+
+.PHONY: tidy
+tidy:: ## Run `go mod tidy`
+	go mod tidy