(file): Removed ctime and atime. Added mtime. Added sha1sum,

	verified and broken.

createdb.sql

@@ -20,13 +20,19 @@ create table file (
 	file_id int64 auto_increment	primary key not null,
 	filename varchar(255)		not null,
 	dir_id int64			not null references base(dir_id),
-	ctime datetime			not null,
-	atime datetime			not null,
+	mtime datetime			not null,
 	size int64			not null,
-	md5sum char(32)			not null,
+	md5sum  char(32)		not null,
+	sha1sum char(40)		not null,
+	
+	# When was the on-line file last verified?
+	verified datetime		not null,
+
+	# Set if the on-line file is missing or modified.
+	broken bool			not null,
 
 	INDEX(filename),
-	UNIQUE(filename, size, ctime, atime, md5sum),
+	UNIQUE(filename, size, mtime, md5sum),
 	INDEX(md5sum),
 	INDEX(size)
 );