CREATE TABLE IF NOT EXISTS sla_policies (
    id SERIAL PRIMARY KEY,
    account_id INTEGER NOT NULL,
    name VARCHAR(255) NOT NULL,
    description TEXT,
    first_response_time_threshold INTEGER DEFAULT 0,
    next_response_time_threshold INTEGER DEFAULT 0,
    resolution_time_threshold INTEGER DEFAULT 0,
    only_during_business_hours BOOLEAN DEFAULT FALSE,
    paused_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),
    deleted_at TIMESTAMPTZ
);
CREATE INDEX IF NOT EXISTS idx_sla_policies_account_id ON sla_policies(account_id);
CREATE INDEX IF NOT EXISTS idx_sla_policies_paused_at ON sla_policies(paused_at);
CREATE INDEX IF NOT EXISTS idx_sla_policies_deleted_at ON sla_policies(deleted_at);

CREATE TABLE IF NOT EXISTS sla_policy_inboxes (
    id SERIAL PRIMARY KEY,
    sla_policy_id INTEGER NOT NULL,
    inbox_id INTEGER NOT NULL,
    account_id INTEGER NOT NULL,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),
    deleted_at TIMESTAMPTZ
);
CREATE UNIQUE INDEX IF NOT EXISTS idx_sla_inbox_unique ON sla_policy_inboxes(inbox_id) WHERE deleted_at IS NULL;
CREATE INDEX IF NOT EXISTS idx_sla_policy_inboxes_sla_policy_id ON sla_policy_inboxes(sla_policy_id);
CREATE INDEX IF NOT EXISTS idx_sla_policy_inboxes_account_id ON sla_policy_inboxes(account_id);
CREATE INDEX IF NOT EXISTS idx_sla_policy_inboxes_deleted_at ON sla_policy_inboxes(deleted_at);

CREATE TABLE IF NOT EXISTS applied_slas (
    id SERIAL PRIMARY KEY,
    sla_policy_id INTEGER NOT NULL,
    conversation_id INTEGER NOT NULL,
    account_id INTEGER NOT NULL,
    sla_status VARCHAR(50) NOT NULL DEFAULT 'active',
    frt_target_at TIMESTAMPTZ,
    nrt_target_at TIMESTAMPTZ,
    rt_target_at TIMESTAMPTZ,
    frt_actual_at TIMESTAMPTZ,
    nrt_actual_at TIMESTAMPTZ,
    rt_actual_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),
    deleted_at TIMESTAMPTZ
);
CREATE INDEX IF NOT EXISTS idx_applied_slas_sla_policy_id ON applied_slas(sla_policy_id);
CREATE INDEX IF NOT EXISTS idx_applied_slas_conversation_id ON applied_slas(conversation_id);
CREATE INDEX IF NOT EXISTS idx_applied_slas_account_id ON applied_slas(account_id);
CREATE INDEX IF NOT EXISTS idx_applied_slas_frt_target_at ON applied_slas(frt_target_at);
CREATE INDEX IF NOT EXISTS idx_applied_slas_nrt_target_at ON applied_slas(nrt_target_at);
CREATE INDEX IF NOT EXISTS idx_applied_slas_rt_target_at ON applied_slas(rt_target_at);
CREATE INDEX IF NOT EXISTS idx_applied_slas_deleted_at ON applied_slas(deleted_at);

CREATE TABLE IF NOT EXISTS sla_events (
    id SERIAL PRIMARY KEY,
    applied_sla_id INTEGER NOT NULL,
    account_id INTEGER NOT NULL,
    conversation_id INTEGER NOT NULL,
    inbox_id INTEGER NOT NULL,
    sla_policy_id INTEGER NOT NULL,
    event_type VARCHAR(50) NOT NULL,
    meta JSONB DEFAULT '{}',
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),
    deleted_at TIMESTAMPTZ
);
CREATE INDEX IF NOT EXISTS idx_sla_events_applied_sla_id ON sla_events(applied_sla_id);
CREATE INDEX IF NOT EXISTS idx_sla_events_account_id ON sla_events(account_id);
CREATE INDEX IF NOT EXISTS idx_sla_events_conversation_id ON sla_events(conversation_id);
CREATE INDEX IF NOT EXISTS idx_sla_events_inbox_id ON sla_events(inbox_id);
CREATE INDEX IF NOT EXISTS idx_sla_events_sla_policy_id ON sla_events(sla_policy_id);
CREATE INDEX IF NOT EXISTS idx_sla_events_deleted_at ON sla_events(deleted_at);