diff --git a/backend/alembic/versions/ca7d3c4e8b2a_add_transportation_id_sequences.py b/backend/alembic/versions/ca7d3c4e8b2a_add_transportation_id_sequences.py
new file mode 100644
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+++ b/backend/alembic/versions/ca7d3c4e8b2a_add_transportation_id_sequences.py
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+"""add transportation id sequences
+
+Revision ID: ca7d3c4e8b2a
+Revises: a1b2c3d4e5f6
+Create Date: 2026-05-08 08:34:00.000000
+
+Crea las secuencias `a76.<tabla>_<id>_seq` que los servicios de catálogos de
+transporte (transporter, vehicle, driver, trailer) referencian vía
+`SELECT nextval(...)`. La migración es idempotente y reposiciona cada
+secuencia a `MAX(<id>)` para no chocar con filas pre-existentes.
+"""
+from typing import Sequence, Union
+
+from alembic import op
+
+
+revision: str = "ca7d3c4e8b2a"
+down_revision: Union[str, None] = "a1b2c3d4e5f6"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+# (tabla, columna_id_sustituto) en el esquema a76. El nombre de secuencia
+# resultante es `a76.<tabla>_<columna>_seq`, que es el patrón que los
+# servicios ya consumen (ver transporters/vehicles/drivers/trailers services).
+_SEQUENCE_TARGETS = (
+    ("transporter", "transporter_id"),
+    ("vehicle", "vehicle_id"),
+    ("driver", "driver_id"),
+    ("trailer", "trailer_id"),
+)
+
+
+def _seq_name(table: str, column: str) -> str:
+    return f"{table}_{column}_seq"
+
+
+def upgrade() -> None:
+    for table, column in _SEQUENCE_TARGETS:
+        seq = _seq_name(table, column)
+        op.execute(
+            f'CREATE SEQUENCE IF NOT EXISTS a76."{seq}" '
+            f"AS BIGINT START WITH 1 INCREMENT BY 1"
+        )
+        # Reposicionar la secuencia al MAX(id) actual para evitar colisiones
+        # con datos ya cargados antes de existir la secuencia.
+        op.execute(
+            f"SELECT setval('a76.\"{seq}\"', "
+            f"GREATEST((SELECT COALESCE(MAX({column}), 0) FROM a76.{table}), 1), "
+            f"true)"
+        )
+        op.execute(
+            f'ALTER SEQUENCE a76."{seq}" OWNED BY a76.{table}.{column}'
+        )
+        op.execute(
+            f"ALTER TABLE a76.{table} "
+            f"ALTER COLUMN {column} SET DEFAULT nextval('a76.\"{seq}\"')"
+        )
+
+
+def downgrade() -> None:
+    for table, column in _SEQUENCE_TARGETS:
+        seq = _seq_name(table, column)
+        op.execute(
+            f"ALTER TABLE a76.{table} ALTER COLUMN {column} DROP DEFAULT"
+        )
+        op.execute(f'DROP SEQUENCE IF EXISTS a76."{seq}"')