Skip info for saillines with no preplot.

It may happen that the sailline info file has data for more lines
than are actually in the preplot (e.g., if importing a reduced
preplot file). In this case, we don't want a constraint violation
error due to missing corresponding lines in `preplot_lines` so we
check for that and only import lines that do exist in `preplot_lines`

bin/datastore.py

@@ -274,11 +274,27 @@ class Datastore:
 		with self.conn.cursor() as cursor:
 			cursor.execute("BEGIN;")
 
+			# Check which preplot lines we actually have already imported,
+			# as the line info file may contain extra lines.
+
+			qry = """
+				SELECT line, class
+				FROM preplot_lines
+				ORDER BY line, class;
+			"""
+			cursor.execute(qry)
+			preplot_lines = cursor.fetchall()
+
 			hash = self.add_file(filepath, cursor)
 			count=0
 			for line in lines:
 				count += 1
-				print(f"\u001b[2KSaving line {count} / {len(lines)}", end="\r", flush=True)
+
+				if not (line["sail_line"], "V") in preplot_lines:
+					print(f"\u001b[2KSkipping line {count} / {len(lines)}", end="\n", flush=True)
+					continue
+
+				print(f"\u001b[2KSaving line {count} / {len(lines)}   ", end="\n", flush=True)
 
 				sail_line = line["sail_line"]
 				incr = line.get("incr", True)