create temporary table __crank_v2_context (
    had_mcp_ledger boolean not null
) on commit drop;

insert into __crank_v2_context (had_mcp_ledger)
values (to_regclass(format('%I.%I', current_schema(), '__crank_mcp_migrations')) is not null);

create table __crank_migrations (
    version bigint primary key,
    name text not null unique,
    checksum text not null,
    phase text not null,
    compatibility text not null,
    applied_at timestamptz not null default now()
);

create table __crank_migration_legacy_audit (
    source text not null,
    source_version bigint not null,
    source_checksum text not null,
    imported_at timestamptz not null default now(),
    primary key (source, source_version)
);

insert into __crank_migrations (version, name, checksum, phase, compatibility)
values (
    1,
    'community-baseline-v1',
    'crank-community-baseline-v1',
    'expand',
    'legacy-baseline'
);

insert into __crank_migration_legacy_audit (source, source_version, source_checksum)
values ('core', 1, 'crank-community-baseline-v1');

create table if not exists __crank_mcp_migrations (
    version integer primary key,
    checksum text not null,
    applied_at timestamptz not null default now()
);

create table if not exists mcp_transport_sessions (
    id text primary key,
    protocol_version text not null,
    initialized boolean not null default false,
    supports_elicitation boolean not null default false,
    workspace_slug text not null,
    agent_slug text not null,
    created_at timestamptz not null,
    updated_at timestamptz not null,
    expires_at timestamptz null
);

alter table mcp_transport_sessions
    add column if not exists supports_elicitation boolean not null default false;
alter table mcp_transport_sessions
    add column if not exists expires_at timestamptz null;

create index if not exists mcp_transport_sessions_workspace_agent_idx
    on mcp_transport_sessions(workspace_slug, agent_slug, updated_at desc);
create index if not exists mcp_transport_sessions_expires_at_idx
    on mcp_transport_sessions(expires_at)
    where expires_at is not null;

insert into __crank_mcp_migrations (version, checksum)
values (1, 'mcp-transport-sessions-v1')
on conflict (version) do nothing;

insert into __crank_migration_legacy_audit (source, source_version, source_checksum)
select 'mcp-session', 1, 'mcp-transport-sessions-v1'
from __crank_v2_context
where had_mcp_ledger;

create table if not exists __crank_ext_migrations (
    extension_name text not null,
    version integer not null,
    checksum text null,
    applied_at timestamptz not null default now(),
    primary key (extension_name, version)
);

alter table __crank_ext_migrations
    add column if not exists checksum text null;