Seed provenance + inventory: source links and seed lots (#50) (#64)

Co-authored-by: Steve Dudenhoeffer <[email protected]>

internal/store/gardens.go

@@ -234,6 +234,11 @@ func (d *DB) CopyGarden(ctx context.Context, srcID, ownerID int64, name string)
 			// Unreachable: every active planting joins an object we just copied.
 			return nil, fmt.Errorf("store: copy planting %d: source object %d not copied", p.ID, p.ObjectID)
 		}
+		// A copy must not inherit the source's seed-lot attribution. The copied
+		// plops are a plan, not a second planting out of the same packet, and
+		// carrying the link would double-count that lot's usage — and quietly
+		// attach a private lot to a garden that may later be shared.
+		p.SeedLotID = nil
 		if _, err := scanPlanting(tx.QueryRowContext(ctx, plantingInsert, plantingInsertArgs(objectID, &p)...)); err != nil {
 			return nil, fmt.Errorf("store: copy planting: %w", err)
 		}