feat(drive): remove all user_id ref in file or folder

src/infrastructure/services/search_index/content_index_worker.rs

@@ -243,21 +243,16 @@ impl ContentIndexWorker {
         // Authoritative state re-read: a queued 'upsert' whose row vanished
         // or got trashed in the meantime becomes a delete.
         //
-        // Post-D7: `fi.user_id` is nullable and new rows land NULL.
-        // The projected `user_id::text` therefore comes back as
-        // `Option<String>`; we normalise to `""` at the tuple boundary
-        // so the downstream indexing code doesn't have to change.
-        // The Tantivy `user_id` field is defence-in-depth only — every
-        // query is Must-scoped by `drive_id`.
-        // (file_id, user_id, drive_id, name, blob_hash, mime, size).
-        // `user_id` is `Option<String>` because post-D7 `storage.files.user_id`
-        // is nullable — new rows land NULL.
-        type FileIndexRow = (Uuid, Option<String>, String, String, String, String, i64);
+        // Post-D7: `fi.user_id` is dropped — no longer projected. The
+        // Tantivy `user_id` field survives as defence-in-depth but now
+        // always indexes `""`. Every query is Must-scoped by `drive_id`.
+        // (file_id, drive_id, name, blob_hash, mime, size).
+        type FileIndexRow = (Uuid, String, String, String, String, i64);
         let files: Vec<FileIndexRow> = if upsert_candidates.is_empty() {
             Vec::new()
         } else {
             sqlx::query_as(
-                "SELECT fi.id, fi.user_id::text, fi.drive_id::text, fi.name,
+                "SELECT fi.id, fi.drive_id::text, fi.name,
                         fi.blob_hash, fi.mime_type, fi.size
                    FROM storage.files fi
                   WHERE fi.id = ANY($1) AND NOT fi.is_trashed",
@@ -272,10 +267,10 @@ impl ContentIndexWorker {
         // Per-blob text: batch-read the extraction cache, extract misses.
         let wanted_hashes: Vec<String> = files
             .iter()
-            .filter(|(_, _, _, name, _, mime, size)| {
+            .filter(|(_, _, name, _, mime, size)| {
                 text_extractor::supports(name, mime) && *size as u64 <= self.max_extract_file_bytes
             })
-            .map(|f| f.4.clone())
+            .map(|f| f.3.clone())
             .collect();
         let mut text_by_hash: HashMap<String, Option<String>> = HashMap::new();
         if !wanted_hashes.is_empty() {
@@ -292,7 +287,7 @@ impl ContentIndexWorker {
         }
 
         let mut records = Vec::with_capacity(files.len());
-        for (file_id, user_id, drive_id, name, blob_hash, mime, size) in files {
+        for (file_id, drive_id, name, blob_hash, mime, size) in files {
             let supported = text_extractor::supports(&name, &mime);
             let content = if !supported {
                 None
@@ -311,7 +306,7 @@ impl ContentIndexWorker {
                 .map(|t| truncate_on_char(t, PREVIEW_BYTES));
             records.push(IndexDocRecord {
                 file_id: file_id.to_string(),
-                user_id: user_id.unwrap_or_default(),
+                user_id: String::new(),
                 drive_id,
                 name,
                 content,