diff --git a/src/commands/import.ts b/src/commands/import.ts
index 37d3d3dad..3270f9137 100644
--- a/src/commands/import.ts
+++ b/src/commands/import.ts
@@ -548,7 +548,10 @@ export function collectSyncableFiles(dir: string, opts: CollectOpts = {}): strin
       // Same set the legacy walkers honored, surfaced once at the top of
       // every iteration.
       if (entry.startsWith('.')) continue;
-      if (entry === 'node_modules' || entry === 'ops') continue;
+      // `venv` is the Python equivalent of `node_modules`: a vendored
+      // dependency tree (often thousands of files) that floods the slug
+      // namespace and triggers ON CONFLICT collisions on first full sync.
+      if (entry === 'node_modules' || entry === 'ops' || entry === 'venv') continue;
 
       const full = join(d, entry);
       let stat;
diff --git a/src/core/sync.ts b/src/core/sync.ts
index 6604343a6..1a753cb4c 100644
--- a/src/core/sync.ts
+++ b/src/core/sync.ts
@@ -241,6 +241,11 @@ function matchesAnyGlob(path: string, patterns?: string[]): boolean {
  */
 const PRUNE_DIR_NAMES = new Set<string>([
   'node_modules',
+  // Python venv: vendored dependency tree, the `node_modules` analogue.
+  // Like `node_modules` it lacks a leading dot so isSyncable's dot-prefix
+  // exclusion misses it; explicit entry keeps incremental sync consistent
+  // with the first-sync walker in commands/import.ts.
+  'venv',
   '.raw',
   'ops',
 ]);