# Backfills duplicate detection for historical issues using Claude Code.

# Triggered manually via workflow_dispatch.

name: Backfill Duplicate Detection

on:

workflow_dispatch:

inputs:

days_back:

description: 'How many days back to look for issues (default: 30)'

required: false

default: '30'

type: number

permissions:

contents: read

issues: write

actions: write

jobs:

backfill:

runs-on: ubuntu-latest

timeout-minutes: 10

steps:

- uses: actions/checkout@v4

- name: Fetch issues and run dedupe

env:

GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

REPO: ${{ github.repository }}

DAYS_BACK: ${{ inputs.days_back || '30' }}

run: |

if ! [[ "$DAYS_BACK" =~ ^[0-9]+$ ]]; then

echo "Error: days_back must be a number"

exit 1

fi

SINCE=$(date -u -d "$DAYS_BACK days ago" +%Y-%m-%dT%H:%M:%SZ 2>/dev/null || date -u -v-${DAYS_BACK}d +%Y-%m-%dT%H:%M:%SZ)

echo "Fetching open issues since $SINCE"

# Get open issues via gh api --paginate, filter out PRs and already-labeled ones

ISSUES=$(gh api --paginate "repos/$REPO/issues?state=open&per_page=100" \

--jq "[.[] | select(.pull_request == null) | select(.created_at >= \"$SINCE\") | select([.labels[].name] | index(\"duplicate\") | not)] | .[].number" | xargs)

if [ -z "$ISSUES" ]; then

echo "No issues to process"

exit 0

fi

BATCH_SIZE=10

COUNT=0

echo "Issues to process: $ISSUES"

for NUMBER in $ISSUES; do

echo "Triggering dedupe for issue #$NUMBER"

gh workflow run issue-dedupe.yml --repo "$REPO" -f issue_number="$NUMBER"

COUNT=$((COUNT + 1))

if [ $((COUNT % BATCH_SIZE)) -eq 0 ]; then

echo "Pausing 60s after $COUNT issues..."

sleep 60

else

sleep 5

fi

done

echo "Backfill triggered for $COUNT issues"