prevent running migrations if is_fresh_install

+ fix: sqlite3.ProgrammingError: Cannot operate on a closed cursor on ProcessAlbumColors()
+ move processing artist images from periodic_scans to Populate
+ bump hash string limit from 7 to 10
+ add last_mod property to database
+ fix: TypeError: '<' not supported between instances of 'int' and 'str' on album page

app/utils/hashing.py

@@ -3,7 +3,7 @@ import hashlib
 from unidecode import unidecode
 
 
-def create_hash(*args: str, decode=False, limit=7) -> str:
+def create_hash(*args: str, decode=False, limit=10) -> str:
     """
     Creates a simple hash for an album
     """
@@ -19,7 +19,7 @@ def create_hash(*args: str, decode=False, limit=7) -> str:
     return str_[-limit:]
 
 
-def create_folder_hash(*args: str, limit=7) -> str:
+def create_folder_hash(*args: str, limit=10) -> str:
     """
     Creates a simple hash for an album
     """