feat: incremental history cache, errors tab, Forgejo migration

- Cache current log file incrementally by line count/inode to avoid re-processing the whole file every refresh. - Collect 4xx/5xx errors during aggregation and add [4] ERRORS tab. - Update README URLs and brew tap to point to git.janvete.com. - Replace GitHub Actions workflow with Forgejo Actions release workflow.
2026-09-10 09:10:14 +02:00 · 2026-09-10 09:10:14 +02:00 · 400c472048
commit 400c472048
parent edc48c2953
7 changed files with 313 additions and 63 deletions
--- a/.forgejo/workflows/release.yml
+++ b/.forgejo/workflows/release.yml
@ -5,21 +5,23 @@ on:
    tags:
      - 'v[0-9]*'

-permissions:
-  contents: write
-
 jobs:
  release:
    runs-on: ubuntu-latest
+    container:
+      image: golang:1.27

    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-go@v5
-        with:
-          go-version-file: go.mod
+      - name: Checkout source
+        env:
+          FORGEJO_TOKEN: ${{ secrets.FORGEJO_TOKEN }}
+        run: |
+          git clone "https://token:${FORGEJO_TOKEN}@git.janvete.com/seth/Caddyview.git" src
+          cd src
+          git checkout "${{ github.ref_name }}"

      - name: Build binaries and archives
+        working-directory: src
        run: |
          VERSION=${{ github.ref_name }}
          mkdir -p dist
@ -37,16 +39,42 @@ jobs:
          echo "=== SHA256 checksums ==="
          sha256sum dist/*.tar.gz

-      - name: Create GitHub Release
+      - name: Create Forgejo Release
+        working-directory: src
        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          FORGEJO_TOKEN: ${{ secrets.FORGEJO_TOKEN }}
+          FORGEJO_URL: https://git.janvete.com
        run: |
          VERSION=${{ github.ref_name }}
-          gh release create "$VERSION" dist/*.tar.gz \
-            --title "$VERSION" \
-            --generate-notes
+          API="${FORGEJO_URL}/api/v1/repos/seth/Caddyview"
+
+          RELEASE_JSON=$(curl -sS -H "Authorization: token ${FORGEJO_TOKEN}" \
+            -H "Content-Type: application/json" \
+            -X POST \
+            -d "{\"tag_name\":\"${VERSION}\",\"name\":\"${VERSION}\",\"draft\":false,\"prerelease\":false}" \
+            "${API}/releases")
+
+          echo "Release response: ${RELEASE_JSON}"
+          RELEASE_ID=$(echo "${RELEASE_JSON}" | grep -o '"id":[0-9]*' | head -1 | cut -d: -f2)
+
+          if [ -z "${RELEASE_ID}" ]; then
+            echo "Failed to create release"
+            exit 1
+          fi
+
+          echo "release_id=${RELEASE_ID}" >> "$GITHUB_ENV"
+
+          for ARCHIVE in dist/*.tar.gz; do
+            NAME=$(basename "${ARCHIVE}")
+            curl -sS -H "Authorization: token ${FORGEJO_TOKEN}" \
+              -H "Content-Type: application/gzip" \
+              --data-binary "@${ARCHIVE}" \
+              "${API}/releases/${RELEASE_ID}/assets?name=${NAME}"
+            echo "Uploaded ${NAME}"
+          done

      - name: Update Homebrew formula
+        working-directory: src
        env:
          TAP_TOKEN: ${{ secrets.TAP_TOKEN }}
        run: |
@ -61,23 +89,23 @@ jobs:
          cat > tap/Formula/caddyview.rb << FORMULA
          class Caddyview < Formula
            desc "TUI SSH monitor for Caddy web server logs"
-            homepage "https://github.com/janvete/caddyview"
+            homepage "https://git.janvete.com/seth/Caddyview"
            version "${VER}"
            license "MIT"

            on_macos do
              if Hardware::CPU.arm?
-                url "https://github.com/janvete/caddyview/releases/download/${VERSION}/caddyview-${VERSION}-darwin-arm64.tar.gz"
+                url "https://git.janvete.com/seth/Caddyview/releases/download/${VERSION}/caddyview-${VERSION}-darwin-arm64.tar.gz"
                sha256 "${SHA_ARM64}"
              else
-                url "https://github.com/janvete/caddyview/releases/download/${VERSION}/caddyview-${VERSION}-darwin-amd64.tar.gz"
+                url "https://git.janvete.com/seth/Caddyview/releases/download/${VERSION}/caddyview-${VERSION}-darwin-amd64.tar.gz"
                sha256 "${SHA_AMD64}"
              end
            end

            on_linux do
              if Hardware::CPU.intel?
-                url "https://github.com/janvete/caddyview/releases/download/${VERSION}/caddyview-${VERSION}-linux-amd64.tar.gz"
+                url "https://git.janvete.com/seth/Caddyview/releases/download/${VERSION}/caddyview-${VERSION}-linux-amd64.tar.gz"
                sha256 "${SHA_LINUX}"
              end
            end
@ -93,8 +121,8 @@ jobs:
          FORMULA

          cd tap
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          git config user.name "github-actions[bot]"
+          git config user.email "forgejo-actions[bot]@users.noreply.github.com"
+          git config user.name "forgejo-actions[bot]"
          git add Formula/caddyview.rb
          git commit -m "chore: bump caddyview to ${VERSION}"
          git push
--- a/README.md
+++ b/README.md
@ -7,14 +7,17 @@ Remote Caddy log viewer over SSH.
 ### macOS (Homebrew)

 ```bash
-brew tap janvete/caddyview
+brew tap janvete/tools
 brew install caddyview
 ```

 ### Linux

+Download the latest release from the [releases page](https://git.janvete.com/seth/Caddyview/releases) and extract it:
+
 ```bash
-curl -L https://github.com/janvete/caddyview/releases/latest/download/caddyview-v0.6.0-linux-amd64.tar.gz | tar xz
+VERSION=v0.6.0
+curl -L "https://git.janvete.com/seth/Caddyview/releases/download/${VERSION}/caddyview-${VERSION}-linux-amd64.tar.gz" | tar xz
 sudo mv caddyview /usr/local/bin/
 ```

@ -25,6 +28,8 @@ caddyview ssh root@192.168.x.x
 caddyview ssh -p 2222 admin@server.com
 ```

+Press `[1]` for live traffic, `[2]` for last 24 hours, `[3]` for last 7 days, and `[4]` to view recent 4xx/5xx errors with URL and origin.
+
 ## Required Caddyfile Changes

 ### 1. Add a log block to your Caddyfile
@ -68,3 +73,12 @@ chown caddy:caddy /var/log/caddy/access.log
 ```bash
 systemctl reload caddy
 ```
+
+## Development
+
+The source repository is hosted at `https://git.janvete.com/seth/Caddyview`.
+To clone via SSH use the dedicated SSH endpoint:
+
+```bash
+git clone ssh://git@git-ssh.janvete.com:554/seth/Caddyview.git
+```
--- a/go.mod
+++ b/go.mod
@ -2,11 +2,16 @@ module github.com/janvete/caddyview

 go 1.26.4

+require (
+	github.com/charmbracelet/bubbletea v1.3.10
+	github.com/charmbracelet/lipgloss v1.1.0
+	github.com/spf13/cobra v1.10.2
+	golang.org/x/crypto v0.53.0
+)
+
 require (
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
-	github.com/charmbracelet/bubbletea v1.3.10 // indirect
 	github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc // indirect
-	github.com/charmbracelet/lipgloss v1.1.0 // indirect
 	github.com/charmbracelet/x/ansi v0.10.1 // indirect
 	github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd // indirect
 	github.com/charmbracelet/x/term v0.2.1 // indirect
@ -20,10 +25,8 @@ require (
 	github.com/muesli/cancelreader v0.2.2 // indirect
 	github.com/muesli/termenv v0.16.0 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/spf13/cobra v1.10.2 // indirect
 	github.com/spf13/pflag v1.0.9 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
-	golang.org/x/crypto v0.53.0 // indirect
 	golang.org/x/sys v0.46.0 // indirect
 	golang.org/x/text v0.38.0 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -44,14 +44,14 @@ github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJu
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 golang.org/x/crypto v0.53.0 h1:QZ4Muo8THX6CizN2vPPd5fBGHyogrdK9fG4wLPFUsto=
 golang.org/x/crypto v0.53.0/go.mod h1:DNLU434OwVakk9PzuwV8w62mAJpRJL3vsgcfp4Qnsio=
+golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561 h1:MDc5xs78ZrZr3HMQugiXOAkSZtfTpbJLDr/lwfgO53E=
+golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
 golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.36.0 h1:KVRy2GtZBrk1cBYA7MKu5bEZFxQk4NIDV6RLVcC8o0k=
-golang.org/x/sys v0.36.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 golang.org/x/sys v0.46.0 h1:noSf2Fq6F8DBgS+LysIkx7rIExoNHJsxOAtPp4rthXw=
 golang.org/x/sys v0.46.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
-golang.org/x/text v0.3.8 h1:nAL+RVCQ9uMn3vJZbV+MRnydTJFPf8qqY42YiA6MrqY=
-golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
+golang.org/x/term v0.44.0 h1:0rLvDRCtNj0gZkyIXhCyOb2OAzEhLVqc4B+hrsBhrmc=
+golang.org/x/term v0.44.0/go.mod h1:7ze4MdzUzLXpSAoFP1H0bOI9aXDqveSvatT5vKcFh2Y=
 golang.org/x/text v0.38.0 h1:sXmwo9DwP3OK9EZ7PqAdaooSGozfl/3a6/xJcbzPRhE=
 golang.org/x/text v0.38.0/go.mod h1:YXZt3QhHUKYT53r2lLKFIVi6Ao1jdzrTR/KQ09qyxF4=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
--- a/internal/parser/caddy.go
+++ b/internal/parser/caddy.go
@ -98,6 +98,18 @@ type Bucket struct {
 	Bytes    int64
 }

+// -- ErrorEntry (4xx/5xx detail) ----------------------------------------------
+
+// ErrorEntry holds one failed request for the errors panel.
+type ErrorEntry struct {
+	Time     time.Time
+	Status   int
+	Method   string
+	URI      string
+	Host     string
+	RemoteIP string
+}
+
 // -- AggregatedHistory (server-side aggregation result) -----------------------

 // AggregatedBucket is one time bucket returned by server-side awk aggregation.
@ -115,12 +127,13 @@ type AggregatedHistory struct {
 	TotalReqs  int64
 	TotalBytes int64
 	DurSumSecs float64
+	Errors     []ErrorEntry
 }

-// FilterSince drops buckets older than the window and recomputes totals from
-// the remaining buckets, so the chart and the totals always agree. TopHosts and
-// TopIPs come from whole rotated files and may slightly overcount at the oldest
-// edge of the window — acceptable for a monitoring view.
+// FilterSince drops buckets and errors older than the window and recomputes
+// totals from the remaining buckets, so the chart and totals always agree.
+// TopHosts and TopIPs come from whole rotated files and may slightly overcount
+// at the oldest edge of the window — acceptable for a monitoring view.
 func (h *AggregatedHistory) FilterSince(since int64) {
 	avgDur := 0.0
 	if h.TotalReqs > 0 {
@ -139,6 +152,14 @@ func (h *AggregatedHistory) FilterSince(since int64) {
 	h.TotalReqs = reqs
 	h.TotalBytes = bytes
 	h.DurSumSecs = avgDur * float64(reqs)
+
+	keptErrs := h.Errors[:0]
+	for _, e := range h.Errors {
+		if e.Time.Unix() >= since {
+			keptErrs = append(keptErrs, e)
+		}
+	}
+	h.Errors = keptErrs
 }

 // ToStats converts aggregated history to a Stats object for use in the TUI panels.
@ -186,6 +207,22 @@ func (h *AggregatedHistory) ToBuckets(size time.Duration) []Bucket {
 	return out
 }

+// RecentErrors returns the last n errors sorted by time (newest first).
+func (h *AggregatedHistory) RecentErrors(n int) []ErrorEntry {
+	if n <= 0 {
+		return nil
+	}
+	sorted := make([]ErrorEntry, len(h.Errors))
+	copy(sorted, h.Errors)
+	sort.Slice(sorted, func(i, j int) bool {
+		return sorted[i].Time.After(sorted[j].Time)
+	})
+	if len(sorted) > n {
+		return sorted[:n]
+	}
+	return sorted
+}
+
 // ParseAggregatedOutput parses the concatenated output of per-file server-side
 // awk aggregations. Sections may repeat (one set per log file) and are merged:
 // bucket counts sum by timestamp, host/IP counts sum by key, totals sum.
@ -198,6 +235,8 @@ func (h *AggregatedHistory) ToBuckets(size time.Duration) []Bucket {
 //	<count> <host>
 //	IPS
 //	<count> <ip>
+//	ERRORS
+//	<unix_ts>\t<status>\t<method>\t<uri>\t<host>\t<remote_ip>
 //	TOTALS
 //	<total_reqs> <total_bytes> <duration_sum_secs>
 func ParseAggregatedOutput(raw string) (*AggregatedHistory, error) {
@ -215,7 +254,7 @@ func ParseAggregatedOutput(raw string) (*AggregatedHistory, error) {
 			continue
 		}
 		switch line {
-		case "BUCKETS", "HOSTS", "IPS", "TOTALS":
+		case "BUCKETS", "HOSTS", "IPS", "ERRORS", "TOTALS":
 			section = line
 			sawSection = true
 			continue
@ -259,6 +298,26 @@ func ParseAggregatedOutput(raw string) (*AggregatedHistory, error) {
 			count, _ := strconv.ParseInt(fields[0], 10, 64)
 			h.TopIPs[fields[1]] += count

+		case "ERRORS":
+			// Tab-separated: ts status method uri host remote_ip
+			parts := strings.Split(line, "\t")
+			if len(parts) < 6 {
+				continue
+			}
+			ts, err := strconv.ParseInt(parts[0], 10, 64)
+			if err != nil {
+				continue
+			}
+			status, _ := strconv.Atoi(parts[1])
+			h.Errors = append(h.Errors, ErrorEntry{
+				Time:     time.Unix(ts, 0),
+				Status:   status,
+				Method:   parts[2],
+				URI:      parts[3],
+				Host:     parts[4],
+				RemoteIP: parts[5],
+			})
+
 		case "TOTALS":
 			if len(fields) < 2 {
 				continue
--- a/internal/sshclient/client.go
+++ b/internal/sshclient/client.go
@ -73,7 +73,6 @@ func (c *Client) StreamLines(path string, lines chan<- string, done <-chan struc

 	stdout, err := session.StdoutPipe()
 	if err != nil {
-		session.Close()
 		return err
 	}

@ -231,10 +230,11 @@ func parseCPUStat(raw string) float64 {
 	return (totalDiff - idleDiff) / totalDiff * 100
 }

-// historyAwkProg aggregates Caddy JSON log lines into hourly summary buckets.
-// It runs entirely on the server and uses only POSIX awk constructs (works
-// with gawk, mawk and busybox awk). IPs are capped to the top 50 per file so
-// the output stays small even on servers with millions of unique clients.
+// historyAwkProg aggregates Caddy JSON log lines into hourly summary buckets
+// and collects the last 100 4xx/5xx errors per file. It runs entirely on the
+// server and uses only POSIX awk constructs (works with gawk, mawk and busybox
+// awk). IPs are capped to the top 50 per file so the output stays small even on
+// servers with millions of unique clients.
 const historyAwkProg = `
 BEGIN { OFS=" " }
 {
@ -244,6 +244,7 @@ BEGIN { OFS=" " }
  ts = substr($0,p+5,20)+0
  if (ts < cutoff) next
  b = int(ts/bucket)*bucket
+
  p = index($0,"\"status\":")
  st = (p>0) ? substr($0,p+9,5)+0 : 0
  p = index($0,"\"size\":")
@ -254,6 +255,11 @@ BEGIN { OFS=" " }
  if (p>0) { rest=substr($0,p+8); q=index(rest,"\""); ho=(q>0)?substr(rest,1,q-1):"?" } else ho="?"
  p = index($0,"\"remote_ip\":\"")
  if (p>0) { rest=substr($0,p+13); q=index(rest,"\""); ip=(q>0)?substr(rest,1,q-1):"?" } else ip="?"
+  p = index($0,"\"uri\":\"")
+  if (p>0) { rest=substr($0,p+7); q=index(rest,"\""); uri=(q>0)?substr(rest,1,q-1):"?" } else uri="?"
+  p = index($0,"\"method\":\"")
+  if (p>0) { rest=substr($0,p+10); q=index(rest,"\""); meth=(q>0)?substr(rest,1,q-1):"?" } else meth="?"
+
  bc[b]++; bb[b]+=sz
  if (st>=500) bs5[b]++
  else if (st>=400) bs4[b]++
@ -261,6 +267,14 @@ BEGIN { OFS=" " }
  else if (st>=200) bs2[b]++
  hc[ho]++; ic[ip]++
  tot++; totb+=sz; totd+=du
+
+  if (st >= 400) {
+    err[++errN] = ts "\t" st "\t" meth "\t" uri "\t" ho "\t" ip
+    if (errN > 100) {
+      for (i=2; i<=errN; i++) err[i-1] = err[i]
+      errN--
+    }
+  }
 }
 END {
  print "BUCKETS"
@ -277,6 +291,8 @@ END {
    delete ic[mi]
    k--; n--
  }
+  print "ERRORS"
+  for (i=1; i<=errN; i++) print err[i]
  print "TOTALS"
  print tot+0, totb+0, totd+0
 }`
@ -287,11 +303,13 @@ END {
 //
 // Rotated log files are immutable, so each one is aggregated exactly once and
 // the result is cached on the server (/tmp/caddyview_*.cache); after a
-// rotation only the single new file is scanned. The current log file is always
-// scanned fresh, so the view never goes stale. Buckets are always hourly; the
-// caller re-buckets client-side, which lets all tabs share the same caches.
+// rotation only the single new file is scanned. The current log file is cached
+// incrementally: only newly appended lines are processed on refresh, so even a
+// 100 MB active log refreshes in seconds. Buckets are always hourly; the caller
+// re-buckets client-side, which lets all tabs share the same caches.
 //
-// since: unix cutoff for the current (still growing) log file
+// since: unix cutoff used client-side after aggregation (ignored server-side so
+// the cache can be reused across different windows).
 // maxAgeDays: only look at files modified within this many days
 func (c *Client) LoadAggregatedHistory(logPath string, since int64, maxAgeDays int) (*parser.AggregatedHistory, error) {
 	lastSlash := strings.LastIndex(logPath, "/")
@ -315,25 +333,65 @@ func (c *Client) LoadAggregatedHistory(logPath string, since int64, maxAgeDays i
 		base, base, stem, ext, stem, ext,
 	)

-	cmd := fmt.Sprintf(
-		`find /tmp -maxdepth 1 -name 'caddyview_*' -mtime +8 -delete 2>/dev/null; `+
-			`find %s %s -type f -mtime -%d 2>/dev/null | sort | while read -r f; do `+
-			`if [ "$f" = "%s" ]; then `+
-			`awk -v cutoff=%d -v bucket=3600 '%s' < "$f"; `+
-			`else `+
-			`key=$(printf '%%s' "$f" | tr -c 'A-Za-z0-9' '_'); c="/tmp/caddyview_${key}.cache"; `+
-			`if [ -s "$c" ] && [ "$c" -nt "$f" ]; then cat "$c"; else `+
-			`t=$(mktemp /tmp/caddyview.XXXXXX 2>/dev/null) || t="/tmp/caddyview_tmp.$$"; `+
-			`case "$f" in *.gz) zcat "$f" ;; *) cat "$f" ;; esac 2>/dev/null `+
-			`| awk -v cutoff=0 -v bucket=3600 '%s' > "$t" && mv "$t" "$c" && cat "$c" || cat "$t" 2>/dev/null; `+
-			`fi; fi; done`,
+	cacheKey := func(path string) string {
+		return strings.Map(func(r rune) rune {
+			if (r >= 'A' && r <= 'Z') || (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') {
+				return r
+			}
+			return '_'
+		}, path)
+	}
+	key := cacheKey(logPath)
+
+	// Shell script that aggregates each file. The current log is handled
+	// incrementally via a line-count/inode marker; rotated files use immutable caches.
+	script := fmt.Sprintf(
+		`set -e
+find /tmp -maxdepth 1 -name 'caddyview_*' -mtime +8 -delete 2>/dev/null || true
+find %s %s -type f -mtime -%d 2>/dev/null | sort | while read -r f; do
+  if [ "$f" = "%s" ]; then
+    c="/tmp/caddyview_%s.cache"
+    m="/tmp/caddyview_%s.marker"
+    read inode < <(stat -c '%%i' "$f" 2>/dev/null || echo "0")
+    read lines < <(wc -l < "$f" 2>/dev/null || echo "0")
+    use_old=false
+    if [ -s "$c" ] && [ -s "$m" ]; then
+      read old_inode old_lines < "$m"
+      if [ "$inode" = "$old_inode" ] && [ "$lines" -ge "$old_lines" ]; then
+        use_old=true
+      fi
+    fi
+    if [ "$use_old" = true ]; then
+      cat "$c"
+      if [ "$lines" -gt "$old_lines" ]; then
+        tail -n +$((old_lines + 1)) "$f" 2>/dev/null | awk -v cutoff=0 -v bucket=3600 '%s'
+      fi
+    else
+      awk -v cutoff=0 -v bucket=3600 '%s' < "$f" > "$c"
+    fi
+    echo "$inode $lines" > "$m"
+    if [ "$use_old" != "true" ]; then cat "$c"; fi
+  else
+    key=$(printf '%%s' "$f" | tr -c 'A-Za-z0-9' '_')
+    c="/tmp/caddyview_${key}.cache"
+    if [ -s "$c" ] && [ "$c" -nt "$f" ]; then
+      cat "$c"
+    else
+      t=$(mktemp /tmp/caddyview.XXXXXX 2>/dev/null) || t="/tmp/caddyview_tmp.$$"
+      case "$f" in *.gz) zcat "$f" ;; *) cat "$f" ;; esac 2>/dev/null \
+      | awk -v cutoff=0 -v bucket=3600 '%s' > "$t" && mv "$t" "$c" && cat "$c" || cat "$t" 2>/dev/null
+    fi
+  fi
+done`,
 		dir, namePattern, maxAgeDays+1,
 		logPath,
-		since, historyAwkProg,
+		key, key,
+		historyAwkProg,
+		historyAwkProg,
 		historyAwkProg,
 	)

-	out, err := c.RunCommand(cmd)
+	out, err := c.RunCommand(script)
 	if err != nil && strings.TrimSpace(out) == "" {
 		return nil, fmt.Errorf("aggregation failed: %w", err)
 	}
--- a/internal/tui/app.go
+++ b/internal/tui/app.go
@ -18,12 +18,13 @@ import (
 type viewTab int

 const (
-	tabLive viewTab = 0
-	tabDay  viewTab = 1
-	tabWeek viewTab = 2
+	tabLive  viewTab = 0
+	tabDay   viewTab = 1
+	tabWeek  viewTab = 2
+	tabErrors viewTab = 3
 )

-var tabLabels = []string{"[1] LIVE", "[2] 1 DAY", "[3] 1 WEEK"}
+var tabLabels = []string{"[1] LIVE", "[2] 1 DAY", "[3] 1 WEEK", "[4] ERRORS"}

 // tabWindow returns how far back each history tab reaches.
 func tabWindow(t viewTab) time.Duration {
@ -86,6 +87,7 @@ const historyRefreshInterval = 5 * time.Minute
 type historyState struct {
 	stats    *parser.Stats
 	buckets  []parser.Bucket
+	errors   []parser.ErrorEntry
 	loaded   bool
 	loading  bool
 	loadedAt time.Time
@ -244,6 +246,9 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		case "3":
 			m.activeTab = tabWeek
 			return m, m.ensureHistory(tabWeek)
+		case "4":
+			m.activeTab = tabErrors
+			return m, m.ensureHistory(tabDay)
 		}

 	case tickMsg:
@ -252,7 +257,11 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		if m.ticks%sysStatsEvery == 0 {
 			cmds = append(cmds, fetchSysStats(m.client))
 		}
-		if m.activeTab != tabLive {
+		if m.activeTab == tabErrors {
+			if cmd := m.maybeRefreshHistory(tabDay); cmd != nil {
+				cmds = append(cmds, cmd)
+			}
+		} else if m.activeTab != tabLive {
 			if cmd := m.maybeRefreshHistory(m.activeTab); cmd != nil {
 				cmds = append(cmds, cmd)
 			}
@ -280,6 +289,7 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		if msg.err == nil && msg.agg != nil {
 			h.stats = msg.agg.ToStats()
 			h.buckets = msg.agg.ToBuckets(tabBucketSize(msg.tab))
+			h.errors = msg.agg.RecentErrors(100)
 		}

 	case errMsg:
@ -335,8 +345,10 @@ func (m model) View() string {
 		parts = append(parts, m.renderHistory(0, "LAST 24 HOURS"))
 	case tabWeek:
 		parts = append(parts, m.renderHistory(1, "LAST 7 DAYS"))
+	case tabErrors:
+		parts = append(parts, m.renderErrors())
 	}
-	parts = append(parts, styleDim.Render("  [1] LIVE   [2] 1 DAY   [3] 1 WEEK   [Q] QUIT"))
+	parts = append(parts, styleDim.Render("  [1] LIVE   [2] 1 DAY   [3] 1 WEEK   [4] ERRORS   [Q] QUIT"))
 	return lipgloss.JoinVertical(lipgloss.Left, parts...)
 }

@ -451,6 +463,72 @@ func (m model) renderHistory(idx int, label string) string {
 	return lipgloss.JoinVertical(lipgloss.Left, chart, bottom)
 }

+// -- errors view --------------------------------------------------------------
+
+func (m model) renderErrors() string {
+	h := m.history[0] // errors are loaded together with the 1 DAY history
+	if h.loading {
+		return lipgloss.NewStyle().Padding(2, 4).
+			Render(styleWarn.Render("▒▒ LOADING ERRORS ▒▒"))
+	}
+	if !h.loaded {
+		return lipgloss.NewStyle().Padding(2, 4).Render(styleDim.Render("No data loaded."))
+	}
+	if h.err != nil {
+		return lipgloss.NewStyle().Padding(2, 4).
+			Render(styleBad.Render(fmt.Sprintf("ERROR: %v", h.err)))
+	}
+	errs := h.errors
+	if len(errs) == 0 {
+		return lipgloss.NewStyle().Padding(2, 4).
+			Render(styleDim.Render("No 4xx/5xx requests found in the last 24 hours."))
+	}
+
+	age := time.Since(h.loadedAt).Round(time.Second)
+	title := fmt.Sprintf("RECENT 4xx/5xx ERRORS — %d entries — updated %s ago", len(errs), age)
+
+	// Column widths (responsive, but fixed for simplicity)
+	timeW := 19
+	statusW := 7
+	methodW := 7
+	hostW := 28
+	ipW := 16
+	uriW := m.width - timeW - statusW - methodW - hostW - ipW - 14
+	if uriW < 20 {
+		uriW = 20
+	}
+
+	header := fmt.Sprintf("%-*s %-*s %-*s %-*s %-*s %s",
+		timeW, "TIME",
+		statusW, "STATUS",
+		methodW, "METHOD",
+		hostW, "HOST",
+		ipW, "REMOTE IP",
+		"URI",
+	)
+	rows := []string{styleHeader.Render(title), "", styleHeader.Render(header)}
+	for _, e := range errs {
+		statusStr := fmt.Sprintf("%d", e.Status)
+		var statusStyled string
+		if e.Status >= 500 {
+			statusStyled = styleBad.Render(statusStr)
+		} else {
+			statusStyled = styleWarn.Render(statusStr)
+		}
+		host := truncate(e.Host, hostW-1)
+		uri := truncate(e.URI, uriW-1)
+		rows = append(rows, fmt.Sprintf("%-*s %-*s %-*s %-*s %-*s %s",
+			timeW, e.Time.Format("2006-01-02 15:04:05"),
+			statusW, statusStyled,
+			methodW, e.Method,
+			hostW, host,
+			ipW, e.RemoteIP,
+			uri,
+		))
+	}
+	return styleBorder.Width(m.width - 4).Render(strings.Join(rows, "\n"))
+}
+
 // -- bar chart ----------------------------------------------------------------

 func (m model) renderBarChart(buckets []parser.Bucket, bucketSize time.Duration, label string, stats *parser.Stats) string {
@ -630,6 +708,16 @@ func topN(m map[string]int64, n int) []kv {
 	return pairs
 }

+func truncate(s string, max int) string {
+	if max <= 0 {
+		return ""
+	}
+	if len(s) <= max {
+		return s
+	}
+	return s[:max-1] + "…"
+}
+
 func bucketSizeLabel(d time.Duration) string {
 	switch {
 	case d >= 24*time.Hour: