Also, re picks:
Celtics have their own first rounders in 2026, 2027, 2028 (subject to SA pick swap rights), 2030, 2031 and 2032 - they cannot trade 2028, 2030 or 2032 (2032 is frozen, can be unfrozen in 2028 if the Celtics stay below the second apron), and cannot trade both 2026 and 2027. So they have two available to trade.
For second rounders, the Celtics have 2 this year - best of NO, Portland, Minnesota and New York, and best of Milwaukee, Orlando and Detroit. They might have their own pick in 2028 if it's between 31 and 45. They have no second rounders in 2027, 2029 or 2030. They have the worse of their own and Cleveland's picks in 2031 and their own in 2032. So just be aware that four second rounders is all Boston has through 2032.