feat: add source channel context history configuration and original sent timestamp

db/repository.py

@@ -62,6 +62,11 @@ class Repository:
             row = await conn.fetchrow("SELECT * FROM sources WHERE id = $1;", source_id)
             return SourceChannel(**dict(row)) if row else None
 
+    async def update_source_context_count(self, source_id: int, count: int) -> None:
+        pool = await self._get_pool()
+        async with pool.acquire() as conn:
+            await conn.execute("UPDATE sources SET context_message_count = $1 WHERE id = $2;", max(0, count), source_id)
+
     async def delete_source(self, source_id: int) -> None:
         pool = await self._get_pool()
         async with pool.acquire() as conn:
@@ -236,6 +241,7 @@ class Repository:
         is_duplicate: bool = False,
         duplicate_of_id: Optional[int] = None,
         similarity_reason: Optional[str] = None,
+        source_created_at: Optional[datetime] = None,
     ) -> Optional[int]:
         pool = await self._get_pool()
         async with pool.acquire() as conn:
@@ -244,9 +250,9 @@ class Repository:
                     """
                     INSERT INTO posts (
                         source_channel_id, source_message_id, raw_text, media_path,
-                        media_type, content_hash, tags, subject, is_duplicate, duplicate_of_id, similarity_reason, status
+                        media_type, content_hash, tags, subject, is_duplicate, duplicate_of_id, similarity_reason, source_created_at, status
                     )
-                    VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, 'pending_review')
+                    VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, 'pending_review')
                     RETURNING id;
                     """,
                     source_channel_id,
@@ -260,6 +266,7 @@ class Repository:
                     is_duplicate,
                     duplicate_of_id,
                     similarity_reason,
+                    source_created_at,
                 )
                 return row["id"] if row else None
             except asyncpg.UniqueViolationError:
@@ -271,6 +278,33 @@ class Repository:
             row = await conn.fetchrow("SELECT * FROM posts WHERE id = $1;", post_id)
             return _parse_post_row(row) if row else None
 
+    async def get_recent_source_posts(
+        self,
+        source_channel_id: int,
+        limit: int = 5,
+        exclude_post_id: Optional[int] = None
+    ) -> List[Post]:
+        """Fetch the most recent posts from this source channel for narrative context."""
+        if limit <= 0:
+            return []
+        pool = await self._get_pool()
+        async with pool.acquire() as conn:
+            rows = await conn.fetch(
+                """
+                SELECT * FROM posts
+                WHERE source_channel_id = $1
+                  AND is_deleted = FALSE
+                  AND ($2::bigint IS NULL OR id <> $2)
+                ORDER BY COALESCE(source_created_at, created_at) DESC, id DESC
+                LIMIT $3;
+                """,
+                source_channel_id, exclude_post_id, limit
+            )
+            # Return in chronological order so the AI sees the natural progression (earliest to latest)
+            posts = [_parse_post_row(r) for r in rows]
+            posts.reverse()
+            return posts
+
     async def find_candidate_posts_by_tags(
         self,
         tags: List[str],