CREATE TABLE IF NOT EXISTS ledger_reconciliation_sessions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id TEXT NOT NULL,
    account_number TEXT NOT NULL,
    period TEXT NOT NULL,
    fiscal_year INTEGER NOT NULL,
    status TEXT NOT NULL DEFAULT 'open',
    bank_balance NUMERIC(19, 4),
    ledger_balance NUMERIC(19, 4),
    difference NUMERIC(19, 4),
    trace_id UUID NOT NULL,
    metadata JSONB NOT NULL DEFAULT '{}',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    completed_at TIMESTAMPTZ
);

CREATE INDEX idx_recon_sessions_tenant ON ledger_reconciliation_sessions(tenant_id);
CREATE INDEX idx_recon_sessions_account ON ledger_reconciliation_sessions(account_number);
CREATE INDEX idx_recon_sessions_period ON ledger_reconciliation_sessions(period, fiscal_year);
CREATE INDEX idx_recon_sessions_status ON ledger_reconciliation_sessions(status);

CREATE TABLE IF NOT EXISTS ledger_reconciliation_matches (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    session_id UUID NOT NULL REFERENCES ledger_reconciliation_sessions(id) ON DELETE CASCADE,
    transaction_id TEXT NOT NULL,
    entry_id UUID NOT NULL,
    line_account TEXT NOT NULL,
    match_type TEXT NOT NULL DEFAULT 'manual',
    confidence NUMERIC(5, 4),
    matched_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    matched_by TEXT
);

CREATE INDEX idx_recon_matches_session ON ledger_reconciliation_matches(session_id);
CREATE INDEX idx_recon_matches_txn ON ledger_reconciliation_matches(transaction_id);
CREATE INDEX idx_recon_matches_entry ON ledger_reconciliation_matches(entry_id);

CREATE TABLE IF NOT EXISTS ledger_bank_transactions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    session_id UUID REFERENCES ledger_reconciliation_sessions(id) ON DELETE SET NULL,
    transaction_id TEXT NOT NULL UNIQUE,
    transaction_date DATE NOT NULL,
    description TEXT,
    amount NUMERIC(19, 4) NOT NULL,
    currency TEXT NOT NULL DEFAULT 'SEK',
    reference TEXT,
    matched_entry_id TEXT,
    account_number TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_bank_txn_session ON ledger_bank_transactions(session_id);
CREATE INDEX idx_bank_txn_matched ON ledger_bank_transactions(matched_entry_id);
CREATE INDEX idx_bank_txn_account ON ledger_bank_transactions(account_number);

CREATE TABLE IF NOT EXISTS ledger_audit_log (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    table_name TEXT NOT NULL,
    record_id TEXT NOT NULL,
    action TEXT NOT NULL,
    old_values JSONB,
    new_values JSONB,
    changed_by TEXT NOT NULL,
    changed_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_audit_table ON ledger_audit_log(table_name, record_id);
CREATE INDEX idx_audit_changed_at ON ledger_audit_log(changed_at);