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Does PostgreSQL ever create indexes on its own?

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I’m troubleshooting a schema and found this:

Indexes:
    "pk_patient_diagnoses" PRIMARY KEY, btree (id)
    "index_4341548" UNIQUE, btree (id)
    "idx_patient_diagnoses_deleted" btree (deleted)
    "idx_patient_diagnoses_diagnosis_type_id" btree (diagnosis_type_id)
    "idx_patient_diagnoses_icd10" btree (icd10)
    "idx_patient_diagnoses_icd9" btree (diagnosis_code)
    "idx_patient_diagnoses_is_unknown" btree (is_unknown)
    "idx_patient_diagnoses_modified" btree (modified)
    "idx_patient_diagnoses_patient_id" btree (patient_id)
    "idx_patient_diagnoses_uuid" btree (uuid)
    "index_325532921" btree (modified)
    "index_4345603" btree (deleted)
    "index_4349516" btree (diagnosis_type_id)
    "index_4353417" btree (icd10)
    "index_4384754" btree (diagnosis_code)
    "index_4418849" btree (is_unknown)
    "index_4424101" btree (patient_id)
    "index_4428458" btree (uuid)

My questions is whether these “index_*” indexes could have been created by postgresql or whether I have an errant developer using some kinda third-party tool?

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