diff --git a/.env.scrapper b/.env.scrapper
index f4c44ac..c539039 100644
--- a/.env.scrapper
+++ b/.env.scrapper
@@ -1,4 +1,4 @@
 RELEASE=dev
 VERSION=1
 BUILD=3
-FIX=9
+FIX=10
diff --git a/DSL/Resql/ckb/GET/source_file/get_source_file_exists_by_url.sql b/DSL/Resql/ckb/GET/source_file/get_source_file_exists_by_url.sql
index e2a2485..db9cb25 100644
--- a/DSL/Resql/ckb/GET/source_file/get_source_file_exists_by_url.sql
+++ b/DSL/Resql/ckb/GET/source_file/get_source_file_exists_by_url.sql
@@ -1,7 +1,7 @@
 /*
 declaration:
   version: 0.1
-  description: "Check if a non-deleted source_file already exists for a source by URL"
+  description: "Check if a source_file already exists (or has ever existed, including deleted) for a source by URL -- used by sitemap discovery to decide whether a URL is genuinely new. A deleted file must still count as \"exists\" here, otherwise a page a user explicitly removed gets silently re-created as a brand-new record the next time the source is discovered/refreshed."
   method: get
   namespace: source_file
   returns: json
@@ -17,7 +17,7 @@ declaration:
     fields:
       - field: exists
         type: boolean
-        description: "Whether a matching source_file exists"
+        description: "Whether a matching source_file exists (deleted or not)"
 */
 SELECT count(*) > 0 AS exists
 FROM data_collection.source_file
@@ -27,5 +27,4 @@ WHERE (base_id, updated_at) IN (
     WHERE source_base_id = :source_base_id::UUID
     GROUP BY base_id
 ) AND source_base_id = :source_base_id::UUID
-    AND is_deleted = FALSE
     AND url = :url;
diff --git a/scrapper/api/app.py b/scrapper/api/app.py
index 608b5ae..20ccbfe 100644
--- a/scrapper/api/app.py
+++ b/scrapper/api/app.py
@@ -1,6 +1,6 @@
 import json
 import os
-from datetime import datetime
+from datetime import UTC, datetime
 from pathlib import Path
 from scrapper import settings
 
@@ -79,7 +79,7 @@ def trigger_specified_api_files_scrapper_task(
 def generate_edited_metadata(task: EditedMetadataTask) -> str:
     response = requests.get(task.download_url)
     metadata = response.json()
-    metadata["edited_at"] = str(datetime.now())
+    metadata["edited_at"] = str(datetime.now(UTC))
     metadata["metadata"]["edited"] = True
 
     path = Path(task.source_file_path)
diff --git a/scrapper/scrapper/items.py b/scrapper/scrapper/items.py
index d2df80d..4c8dabb 100644
--- a/scrapper/scrapper/items.py
+++ b/scrapper/scrapper/items.py
@@ -1,5 +1,5 @@
 from dataclasses import dataclass, field
-from datetime import datetime
+from datetime import UTC, datetime
 from typing import Optional
 
 
@@ -24,7 +24,13 @@ class MetadataItem:
     page_title: str
     external_id: Optional[str] = ""
     version: str = "1.0"
-    created_at: str = field(default_factory=lambda: str(datetime.now()))
+    # Must be UTC, not naive local time -- this value is sent to Postgres as
+    # `last_scraped_at` (TIMESTAMP WITH TIME ZONE). A naive local timestamp
+    # gets misinterpreted as already-UTC, silently shifting it by the host's
+    # UTC offset -- which can permanently satisfy claim queries like
+    # `last_scraped_at < :reference_time` (itself always computed in UTC),
+    # causing a file to be re-claimed for scraping indefinitely.
+    created_at: str = field(default_factory=lambda: str(datetime.now(UTC)))
     edited_at: str | None = None
     language: Optional[str] = None
 
diff --git a/scrapper/scrapper/spiders/entire_source_spider.py b/scrapper/scrapper/spiders/entire_source_spider.py
index bc9d14c..54cf018 100644
--- a/scrapper/scrapper/spiders/entire_source_spider.py
+++ b/scrapper/scrapper/spiders/entire_source_spider.py
@@ -59,6 +59,14 @@ def start_url_impl(self) -> Iterator[str]:
 
     def urls_iter_impl(self) -> Iterator[str]:
         scrapped_before = datetime.datetime.now(datetime.UTC).isoformat()
+        # get-one-source-file-to-scrape claims any file currently `finished`
+        # and last scraped before `scrapped_before`. This guard is a
+        # defense-in-depth backstop against re-processing the same file
+        # twice within one run (e.g. if the claim query's timing window
+        # ever overlaps) -- it does not address the root cause of a file
+        # being reported as eligible again, which was a naive (non-UTC)
+        # timestamp bug in item construction, fixed separately in items.py.
+        already_claimed_ids: set[str] = set()
 
         while True:
             result = requests.get(
@@ -73,6 +81,10 @@ def urls_iter_impl(self) -> Iterator[str]:
 
             link = LinkToScrape(**result.json()["response"][0])
 
+            if link.id in already_claimed_ids:
+                return
+            already_claimed_ids.add(link.id)
+
             self.urls.append(link)
 
             yield link.url.unicode_string()
diff --git a/scrapper/scrapper/spiders/sitemap_collect_spider.py b/scrapper/scrapper/spiders/sitemap_collect_spider.py
index ce7470f..fdffcb1 100644
--- a/scrapper/scrapper/spiders/sitemap_collect_spider.py
+++ b/scrapper/scrapper/spiders/sitemap_collect_spider.py
@@ -123,6 +123,10 @@ async def parse(
             # pages' content is entire_source_spider's job (it does the
             # hash comparison against the stored version); creating a
             # source_file for it again here would duplicate it.
+            # This check also counts explicitly deleted files as "existing"
+            # (see get_source_file_exists_by_url.sql), so a URL a user
+            # removed on purpose stays excluded on future refreshes instead
+            # of silently reappearing as a new record.
             already_exists = requests.get(
                 f"{self.settings.get('RUUTER_INTERNAL')}/ckb/source-file/get-source-file-exists-by-url",
                 params={"source_id": self.task.source_id, "url": response.url},