CREATE TABLE IF NOT EXISTS ledger_entries (
  id INT AUTO_INCREMENT PRIMARY KEY,
  tenant_id INT NOT NULL,
  participant_id INT NOT NULL,
  type VARCHAR(30) NOT NULL,
  amount_cents INT NOT NULL,
  marks_count INT NULL,
  unit_price_cents INT NULL,
  booked_at DATETIME NOT NULL,
  source VARCHAR(40) NOT NULL DEFAULT 'legacy',
  note VARCHAR(1000) NULL,
  created_by_user_id INT NULL,
  import_batch_id INT NULL,
  legacy_table VARCHAR(100) NULL,
  legacy_id INT NULL,
  voided_at DATETIME NULL,
  reversal_of_entry_id INT NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  UNIQUE KEY uq_ledger_entries_tenant_legacy (tenant_id, legacy_table, legacy_id),
  KEY idx_ledger_entries_tenant_booked_at (tenant_id, booked_at),
  KEY idx_ledger_entries_participant_booked_at (participant_id, booked_at),
  KEY idx_ledger_entries_tenant_type (tenant_id, type),
  KEY idx_ledger_entries_reversal (reversal_of_entry_id),
  KEY idx_ledger_entries_created_by_user (created_by_user_id),
  CONSTRAINT fk_ledger_entries_tenant
    FOREIGN KEY (tenant_id) REFERENCES tenants(id)
    ON DELETE CASCADE,
  CONSTRAINT fk_ledger_entries_participant
    FOREIGN KEY (participant_id) REFERENCES participants(id)
    ON DELETE CASCADE,
  CONSTRAINT fk_ledger_entries_created_by_user
    FOREIGN KEY (created_by_user_id) REFERENCES users(id)
    ON DELETE SET NULL,
  CONSTRAINT fk_ledger_entries_reversal
    FOREIGN KEY (reversal_of_entry_id) REFERENCES ledger_entries(id)
    ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;