`jTdZddlmZddlmZmZdZGddejZy)uPhase 3 — Enforce idswh uniqueness and remove nullability. This migration is safe to run only AFTER 0011 has completed and all GuestStay rows have been backfilled (idswh IS NOT NULL for every row). The AlterField operation: - Adds the UNIQUE constraint to the database column. - Removes NULL from the column definition. Pre-flight check: the migration will fail fast if any NULL values remain, preventing a silent partial constraint. ) annotations) migrationsmodelsc|jdd}|jjdj}|dkDrt d|dy) zAbort if any GuestStay row still has a NULL idswh. This guard prevents the UNIQUE + NOT NULL constraint from being applied to an incompletely backfilled table, which would cause a cryptic DB error. guests GuestStayT) idswh__isnullrz!Cannot enforce idswh uniqueness: zq GuestStay row(s) still have NULL idswh. Run migration 0011 first and verify the backfill completed successfully.N) get_modelobjectsfiltercount RuntimeError)apps schema_editorr null_counts 9/backend/guests/migrations/0012_gueststay_idswh_unique.pyassert_no_nullsrs` x5I"")))=CCEJA~/ |<3 4  c eZdZdgZej eej jejdde jdddddd  gZ y ) Migration)r0011_gueststay_backfill_idswh) reverse_code gueststayidswhTFzPermanent, globally unique regulatory identity token. Generated once at creation. Never recomputed, never overwritten. Used as the canonical identifier across C59, ISTAT, Ross 1000, and Alloggiati Web exports.@)db_indexeditable help_text max_lengthnullunique) model_namenamefieldN) __name__ __module__ __qualname__ dependenciesr RunPythonrnoop AlterFieldr CharField operationsrrrr"ss 4L  _:;O;O;T;TU  ""&""2   JrrN)__doc__ __future__r django.dbrrrrr.rrr2s) #(   $$r