feat(seer): Add SeerRun FK to SeerNightShiftRun

[trevor-e]

Summary

• Adds nullable seer_run FK from SeerNightShiftRun to SeerRun
• Adds nullable result_seer_run FK from SeerNightShiftRunResult to SeerRun

Context

Prerequisite for linking night shift runs to the Sentry-side run mirror tables. The FKs are nullable initially; TODO to make required once backfilled.

Night shift will use type=EXPLORER with source="night_shift" on SeerAgentRun.

Test plan

• Migration applies cleanly
• Existing night shift runs unaffected (FKs are nullable)

🤖 Generated with Claude Code

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/seer/migrations/0015_add_seer_run_fk_to_night_shift.py

for 0015_add_seer_run_fk_to_night_shift in seer

--
-- Add field seer_run to seernightshiftrun
--
ALTER TABLE "seer_nightshiftrun" ADD COLUMN "seer_run_id" bigint NULL;
ALTER TABLE "seer_nightshiftrun" ADD CONSTRAINT "seer_nightshiftrun_seer_run_id_c8367325_fk_seer_seerrun_id" FOREIGN KEY ("seer_run_id") REFERENCES "seer_seerrun" ("id") DEFERRABLE INITIALLY DEFERRED NOT VALID;
ALTER TABLE "seer_nightshiftrun" VALIDATE CONSTRAINT "seer_nightshiftrun_seer_run_id_c8367325_fk_seer_seerrun_id";
CREATE INDEX CONCURRENTLY "seer_nightshiftrun_seer_run_id_c8367325" ON "seer_nightshiftrun" ("seer_run_id");

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/seer/migrations/0015_add_agent_run_fks.py

for 0015_add_agent_run_fks in seer

--
-- Add field agent_run to seernightshiftrun
--
ALTER TABLE "seer_nightshiftrun" ADD COLUMN "agent_run_id" bigint NULL;
--
-- Add field agent_run to seernightshiftrunresult
--
ALTER TABLE "seer_nightshiftrunissue" ADD COLUMN "agent_run_id" bigint NULL;
ALTER TABLE "seer_nightshiftrun" ADD CONSTRAINT "seer_nightshiftrun_agent_run_id_c845e7b3_fk_seer_seer" FOREIGN KEY ("agent_run_id") REFERENCES "seer_seeragentrun" ("id") DEFERRABLE INITIALLY DEFERRED NOT VALID;
ALTER TABLE "seer_nightshiftrun" VALIDATE CONSTRAINT "seer_nightshiftrun_agent_run_id_c845e7b3_fk_seer_seer";
CREATE INDEX CONCURRENTLY "seer_nightshiftrun_agent_run_id_c845e7b3" ON "seer_nightshiftrun" ("agent_run_id");
ALTER TABLE "seer_nightshiftrunissue" ADD CONSTRAINT "seer_nightshiftrunis_agent_run_id_dc83e17b_fk_seer_seer" FOREIGN KEY ("agent_run_id") REFERENCES "seer_seeragentrun" ("id") DEFERRABLE INITIALLY DEFERRED NOT VALID;
ALTER TABLE "seer_nightshiftrunissue" VALIDATE CONSTRAINT "seer_nightshiftrunis_agent_run_id_dc83e17b_fk_seer_seer";
CREATE INDEX CONCURRENTLY "seer_nightshiftrunissue_agent_run_id_dc83e17b" ON "seer_nightshiftrunissue" ("agent_run_id");

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/seer/migrations/0015_add_seer_run_fks.py

for 0015_add_seer_run_fks in seer

--
-- Add field seer_run to seernightshiftrun
--
ALTER TABLE "seer_nightshiftrun" ADD COLUMN "seer_run_id" bigint NULL;
--
-- Add field result_seer_run to seernightshiftrunresult
--
ALTER TABLE "seer_nightshiftrunissue" ADD COLUMN "result_seer_run_id" bigint NULL;
ALTER TABLE "seer_nightshiftrun" ADD CONSTRAINT "seer_nightshiftrun_seer_run_id_c8367325_fk_seer_seerrun_id" FOREIGN KEY ("seer_run_id") REFERENCES "seer_seerrun" ("id") DEFERRABLE INITIALLY DEFERRED NOT VALID;
ALTER TABLE "seer_nightshiftrun" VALIDATE CONSTRAINT "seer_nightshiftrun_seer_run_id_c8367325_fk_seer_seerrun_id";
CREATE INDEX CONCURRENTLY "seer_nightshiftrun_seer_run_id_c8367325" ON "seer_nightshiftrun" ("seer_run_id");
ALTER TABLE "seer_nightshiftrunissue" ADD CONSTRAINT "seer_nightshiftrunis_result_seer_run_id_94035eb3_fk_seer_seer" FOREIGN KEY ("result_seer_run_id") REFERENCES "seer_seerrun" ("id") DEFERRABLE INITIALLY DEFERRED NOT VALID;
ALTER TABLE "seer_nightshiftrunissue" VALIDATE CONSTRAINT "seer_nightshiftrunis_result_seer_run_id_94035eb3_fk_seer_seer";
CREATE INDEX CONCURRENTLY "seer_nightshiftrunissue_result_seer_run_id_94035eb3" ON "seer_nightshiftrunissue" ("result_seer_run_id");

[trevor-e]

@sentry review