feat(Team): add isInLeagueTable and leagueTableRank fields with migration

backend/models/Team.js

@@ -101,6 +101,20 @@ const Team = sequelize.define('Team', {
         allowNull: false,
         defaultValue: 0,
     },
+    // A schedule may contain provisional or stale opponents.  Only teams that
+    // occur in the latest official click-TT table belong in the league table.
+    isInLeagueTable: {
+        type: DataTypes.BOOLEAN,
+        allowNull: false,
+        defaultValue: true,
+    },
+    // click-TT already applies all association-specific tie-breakers. Keep its
+    // rank instead of attempting to recreate those rules locally.
+    leagueTableRank: {
+        type: DataTypes.INTEGER,
+        allowNull: true,
+        defaultValue: null,
+    },
 }, {
     underscored: true,
     tableName: 'team',