packages/spike/src/log.ts

@@ -50,17 +50,11 @@ function createLogFile(): string {
   return `${logsDir}/${timestamp}_${releaseSha}.jsonl`
 }
 
-function extractTimestamp(filename: string): string {
-  const stem = filename.replace(".jsonl", "")
-  // New format: timestamp_sha, Old format: sha_timestamp
-  if (/^\d{4}-/.test(stem)) return stem.split("_").slice(0, -1).join("_")
-  return stem.split("_").pop() || ""
-}
-
 export function listLogFiles(): string[] {
   return readdirSync(logsDir)
     .filter((f) => f.endsWith(".jsonl"))
-    .sort((a, b) => extractTimestamp(b).localeCompare(extractTimestamp(a)))
+    .sort()
+    .reverse()
     .slice(0, 20)
 }
 

packages/spike/src/server/logs.tsx

@@ -108,32 +108,11 @@ function EventRow({ event, index }: { event: StoredLogEvent; index: number }) {
   )
 }
 
-function parseLogFilename(file: string): { sha: string; isoStr: string } {
-  const stem = file.replace(".jsonl", "")
-  // New format: timestamp_sha (e.g. 2026-03-10T18-06-23-561Z_cb10121)
-  // Old format: sha_timestamp (e.g. cb10121_2026-03-10T18-06-23-561Z)
-  const isNewFormat = /^\d{4}-/.test(stem)
-  const parts = stem.split("_")
-
-  let sha: string
-  let rawTimestamp: string
-  if (isNewFormat) {
-    sha = parts.pop() || "unknown"
-    rawTimestamp = parts.join("_")
-  } else {
-    rawTimestamp = parts.pop() || ""
-    sha = parts.join("_") || "unknown"
-  }
-
-  const isoStr = rawTimestamp.replace(/T(\d{2})-(\d{2})-(\d{2})-(\d+)Z/, "T$1:$2:$3.$4Z")
-  return { sha, isoStr }
-}
-
 function Sidebar({ files, selectedFile }: { files: string[]; selectedFile?: string }) {
   // Group files by sha, sorted by most recent file in each group
   const grouped: Record<string, string[]> = {}
   for (const file of files) {
-    const { sha } = parseLogFilename(file)
+    const sha = file.replace(".jsonl", "").split("_").pop() || "unknown"
     const list = grouped[sha] || (grouped[sha] = [])
     list.push(file)
   }
@@ -151,7 +130,8 @@ function Sidebar({ files, selectedFile }: { files: string[]; selectedFile?: stri
           <div style="padding: 4px 16px; color: #6b7280; font-size: 11px; font-family: monospace">{sha}</div>
           {shaFiles.map((file) => {
             const isSelected = file === selectedFile
-            const { isoStr } = parseLogFilename(file)
+            // Parse ISO timestamp back from filename: 2026-03-10T02-56-59-938Z_sha.jsonl
+            const isoStr = file.replace(/_[^_]+\.jsonl$/, "").replace(/T(\d{2})-(\d{2})-(\d{2})-(\d+)Z/, "T$1:$2:$3.$4Z")
             const bg = isSelected ? "#2a2a2a" : "transparent"
             return (
               <a