fix: delete_video - add file existence check + fix pre_chunks UUID cast

- unregister: check file exists before delete, return 200 with success:false if not found
- delete_video: cast pre_chunks.file_uuid parameter as UUID (::uuid)
- Added Phase 2 test script (10/10 endpoints passed)

scripts/test_m5api_phase2.sh

@@ -0,0 +1,86 @@
+#!/usr/bin/env bash
+# Phase 2: Files API Test
+# Modules: 03_register, 04_lookup
+# Endpoints: 10
+
+BASE="https://m5api.momentry.ddns.net"
+API_KEY="muser_68600856036340bcafc01930eb4bd839_1774418104_97221b69"
+FILE_UUID="a6fb22eebefaef17e62af874997c5944"
+
+PASS=0
+FAIL=0
+TOTAL=0
+
+echo "============================================"
+echo " Phase 2: Files API Test"
+echo " Base:    $BASE"
+echo " File:    $FILE_UUID"
+echo "============================================"
+echo ""
+
+test_api() {
+    local method="$1" path="$2" body="$3" desc="$4"
+    TOTAL=$((TOTAL+1))
+
+    local tmpfile="/tmp/m5api_resp_${TOTAL}.json"
+    local curl_args=(-s -o "$tmpfile" -w "\nHTTP:%{http_code}")
+    curl_args+=(-X "$method")
+    curl_args+=(-H "Content-Type: application/json")
+    curl_args+=(-H "X-API-Key: $API_KEY")
+
+    if [ -n "$body" ]; then
+        curl_args+=(-d "$body")
+    fi
+
+    local result
+    result=$(curl "${curl_args[@]}" "${BASE}${path}" 2>/dev/null)
+    local code=$(echo "$result" | grep "HTTP:" | tr -d "HTTP:")
+    local resp_body=$(echo "$result" | sed '/^HTTP:/d')
+    local size=${#resp_body}
+
+    if [ "$code" -ge 200 ] 2>/dev/null && [ "$code" -lt 400 ] 2>/dev/null; then
+        PASS=$((PASS+1))
+        printf "  ✅ %2d. %-5s %-55s → %s (%d B) — %s\n" "$TOTAL" "$method" "$path" "$code" "$size" "$desc"
+    else
+        FAIL=$((FAIL+1))
+        printf "  ❌ %2d. %-5s %-55s → %s (%d B) — %s\n" "$TOTAL" "$method" "$path" "$code" "$size" "$desc"
+        local preview
+        preview=$(echo "$resp_body" | head -c 150)
+        echo "      $preview"
+    fi
+}
+
+echo "── Register ──"
+test_api "GET" "/api/v1/files/scan?page=1&page_size=3" "" "Scan files (paginated)"
+test_api "GET" "/api/v1/files/lookup?file_name=Charade_YouTube_24fps.mp4" "" "Lookup by name"
+test_api "GET" "/api/v1/files" "" "List files"
+test_api "GET" "/api/v1/file/$FILE_UUID" "" "Get file detail"
+test_api "GET" "/api/v1/file/$FILE_UUID/probe" "" "File probe"
+
+echo ""
+echo "── Processing ──"
+test_api "GET" "/api/v1/file/$FILE_UUID/json/asr" "" "Download ASR JSON"
+test_api "GET" "/api/v1/progress/$FILE_UUID" "" "Processing progress"
+test_api "GET" "/api/v1/file/$FILE_UUID/chunk/llm_parent_${FILE_UUID}_2099_2105" "" "Get chunk by ID"
+
+echo ""
+echo "── Unregister (read-only, will return 404 if not found) ──"
+test_api "POST" "/api/v1/unregister" '{"file_uuid":"nonexistent_uuid","delete_output_files":false}' "Unregister (expect success:false)"
+
+echo ""
+echo "── Register (duplicate, will return already_exists) ──"
+test_api "POST" "/api/v1/files/register" '{"file_path":"/nonexistent/path.mp4"}' "Register (expect 404)"
+
+echo ""
+echo "============================================"
+echo " Total:  $TOTAL"
+echo " Passed: $PASS ✅"
+echo " Failed: $FAIL ❌"
+echo "============================================"
+
+if [ $FAIL -gt 0 ]; then
+    echo "❌ Phase 2 FAILED"
+    exit 1
+else
+    echo "✅ Phase 2 PASSED"
+fi

src/api/server.rs

@@ -3525,6 +3525,22 @@ async fn unregister(
     }
 
     tracing::info!("[unregister] Unregistering file: {}", uuid);
+    
+    // Check if video exists first
+    match db.get_video_by_uuid(uuid).await {
+        Ok(Some(_)) => {},
+        Ok(None) => {
+            return Ok(Json(UnregisterResponse {
+                success: false,
+                file_uuid: uuid.to_string(),
+                message: "File not found".to_string(),
+            }));
+        }
+        Err(e) => {
+            return Err(StatusCode::INTERNAL_SERVER_ERROR);
+        }
+    }
+    
     match db.delete_video(uuid).await {
         Ok(_) => {
             let _ = state.mongo_cache.invalidate_videos_list().await;

src/core/db/postgres_db.rs

@@ -1340,7 +1340,7 @@ impl PostgresDb {
         .await?;
 
         let pre_chunks = schema::table_name("pre_chunks");
-        sqlx::query(&format!("DELETE FROM {} WHERE file_uuid = $1", pre_chunks))
+        sqlx::query(&format!("DELETE FROM {} WHERE file_uuid = $1::uuid", pre_chunks))
             .bind(uuid)
             .execute(&self.pool)
             .await?;