Improve market data fetching routines.

rstat_tool/database.py

@@ -373,4 +373,11 @@ def get_all_scanned_subreddits():
     conn = get_db_connection()
     results = conn.execute("SELECT DISTINCT name FROM subreddits ORDER BY name ASC;").fetchall()
     conn.close()
-    return [row['name'] for row in results]
+    return [row['name'] for row in results]
+
+def get_all_tickers():
+    """Retrieves the ID and symbol of every ticker in the database."""
+    conn = get_db_connection()
+    results = conn.execute("SELECT id, symbol FROM tickers;").fetchall()
+    conn.close()
+    return results