hoàn thành tính năng mp3 player

backend/alembic/versions/0003_add_pdf_audios.py

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+"""add pdf_audios table
+
+Revision ID: 0003_add_pdf_audios
+Revises: 0002_add_role_status
+Create Date: 2026-04-02
+"""
+from alembic import op
+import sqlalchemy as sa
+
+revision = "0003_add_pdf_audios"
+down_revision = "0002_add_role_status"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "pdf_audios",
+        sa.Column("id", sa.Integer(), primary_key=True, index=True),
+        sa.Column("pdf_id", sa.Integer(), sa.ForeignKey("pdfs.id", ondelete="CASCADE"), nullable=False, index=True),
+        sa.Column("file_path", sa.Text(), nullable=False),
+        sa.Column("track_name", sa.String(255), nullable=False),
+        sa.Column("page_number", sa.Integer(), nullable=True),
+        sa.Column("sort_order", sa.Integer(), nullable=False, server_default="1"),
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            server_default=sa.func.now(),
+            nullable=False,
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("pdf_audios")