Dropping the column "_s1_bound" from table |_C1| is a destructive transformation
   [Condition of type UNCONFIRMED-DESTRUCTIVE-DROP-COLUMN-ERROR]

Restarts:
 0: [CONTINUE]         Alter the table and let the data go
 1: [ABORT]            Return to SLIME's top level.
 2: [TERMINATE-THREAD] Terminate this thread (#<THREAD "repl-thread" {1005BBA971}>)

Backtrace:
  0: (CL-RDBMS::UPDATE-EXISTING-TABLE |_C1| (#<CL-PEREC::COLUMN _ID {100771D1A1}> #<CL-PEREC::COLUMN _CLASS_NAME {100771F631}> #<CL-PEREC::COLUMN _S1 {10077A33B1}>))
  1: ((SB-PCL::FAST-METHOD CL-PEREC::EXPORT-TO-RDBMS (CL-PEREC::TABLE)) #<unavailable argument> #<unavailable argument> #<CL-PEREC::CLASS-PRIMARY-TABLE _C1 {1006F62711}>)
  2: ((LAMBDA (COMPUTED-CLASS:-SELF- COMPUTED-CLASS:-CURRENT-VALUE-)) #<CL-PEREC::CLASS-PRIMARY-TABLE _C1 {1006F62711}> #<unavailable argument>)
  3: (COMPUTED-CLASS:RECOMPUTE-COMPUTED-STATE #<unavailable lambda list>)
  4: (COMPUTED-CLASS::ENSURE-COMPUTED-STATE-IS-VALID #<unavailable lambda list>)
  5: ((SB-PCL::FAST-METHOD SLOT-VALUE-USING-CLASS (COMPUTED-CLASS:COMPUTED-CLASS COMPUTED-CLASS::COMPUTED-OBJECT COMPUTED-CLASS::COMPUTED-EFFECTIVE-SLOT-DEFINITION)) #<unavailable lambda list>)
  6: (SLOT-VALUE #<CL-PEREC::CLASS-PRIMARY-TABLE _C1 {1006F62711}> CL-PEREC::ENSURE-EXPORTED)
  7: ((LAMBDA (COMPUTED-CLASS:-SELF- COMPUTED-CLASS:-CURRENT-VALUE-)) #<PERSISTENT-CLASS C1> #<unavailable argument>)
  8: (COMPUTED-CLASS:RECOMPUTE-COMPUTED-STATE #<unavailable lambda list>)
  9: (COMPUTED-CLASS::ENSURE-COMPUTED-STATE-IS-VALID #<unavailable lambda list>)
 10: ((SB-PCL::FAST-METHOD SLOT-VALUE-USING-CLASS (COMPUTED-CLASS:COMPUTED-CLASS COMPUTED-CLASS::COMPUTED-OBJECT COMPUTED-CLASS::COMPUTED-EFFECTIVE-SLOT-DEFINITION)) #<unavailable lambda list>)
 11: (SLOT-VALUE #<PERSISTENT-CLASS C1> CL-PEREC::ENSURE-EXPORTED)
 12: (NIL #<unavailable argument> #<unavailable argument> #<PERSISTENT-CLASS C1>)
 13: ((LAMBDA (SB-PCL::.PV-CELL. SB-PCL::.NEXT-METHOD-CALL. #1="#<...>" . #1#)) #<unused argument> #<unused argument> #<PERSISTENT-CLASS C1> 5864073193655 2)
 14: (NIL)
 15: (SB-INT:SIMPLE-EVAL-IN-LEXENV (WITH-TRANSACTION (MAKE-INSTANCE 'C1 :S1 "hello")) #<NULL-LEXENV>)
 16: (SWANK::EVAL-REGION
      "(with-transaction
             (make-instance 'c1 :s1 \"hello\"))
     "
      T)
 17: ((LAMBDA ()))
 18: ((LAMBDA (SWANK-BACKEND::FN)) #<CLOSURE (LAMBDA #) {10076584A9}>)
 19: (SWANK::CALL-WITH-BUFFER-SYNTAX #<CLOSURE (LAMBDA #) {10076584A9}>)
 --more--