fix: cap diff size to prevent SQLite/V8 crash on large files

apply_patch deleting a binary file (e.g. a 142 MB DMG) called
createTwoFilesPatch on the full file content, producing a 380 MB
diff string that was stored verbatim in part.data.  When any query
loaded all rows for that session Node's sqlite StatementSync::All
tried to convert the 380 MB buffer to a V8 string, hitting an
internal V8 assertion and crashing the sidecar.

- apply_patch.ts: skip diff generation for deleted files larger
  than 512 KB (binary files have no useful unified diff anyway).
- edit.ts trimDiff: return "" for any diff already over 512 KB,
  guarding all callers against unexpectedly large inputs.

Also manually truncated the offending DB row
(prt_e1826dea2001zbyfymhOP3BOom, 380 MB → 201 bytes).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 2 people

packages/opencode/src/tool/apply_patch.ts

@@ -165,7 +165,13 @@ export const ApplyPatchTool = Tool.define(
               ),
             )
             const contentToDelete = source.text
-            const deleteDiff = trimDiff(createTwoFilesPatch(filePath, filePath, contentToDelete, ""))
+            // Skip diff for large/binary files to prevent storing hundreds of MB in SQLite.
+            // V8 string limit is ~512MB; a 142MB binary file produces a 380MB+ diff.
+            const DIFF_SIZE_LIMIT = 512 * 1024 // 512 KB
+            const deleteDiff =
+              contentToDelete.length > DIFF_SIZE_LIMIT
+                ? ""
+                : trimDiff(createTwoFilesPatch(filePath, filePath, contentToDelete, ""))
 
             const deletions = contentToDelete.split("\n").length
 

packages/opencode/src/tool/edit.ts

@@ -635,7 +635,10 @@ export const ContextAwareReplacer: Replacer = function* (content, find) {
   }
 }
 
+const DIFF_MAX_BYTES = 512 * 1024 // 512 KB — keeps SQLite rows manageable and well under V8's string limit
+
 export function trimDiff(diff: string): string {
+  if (diff.length > DIFF_MAX_BYTES) return ""
   const lines = diff.split("\n")
   const contentLines = lines.filter(
     (line) =>