CREATE TABLE migrations (
        name TEXT NOT NULL,
        ts TEXT NOT NULL,
        PRIMARY KEY (name)
      );
CREATE TABLE contact_profiles ( -- remote user profile
  contact_profile_id INTEGER PRIMARY KEY,
  display_name TEXT NOT NULL, -- contact name set by remote user (not unique), this name must not contain spaces
  full_name TEXT NOT NULL,
  properties TEXT NOT NULL DEFAULT '{}' -- JSON with contact profile properties
, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL), image TEXT, user_id INTEGER DEFAULT NULL REFERENCES users ON DELETE CASCADE);
CREATE INDEX contact_profiles_index ON contact_profiles (display_name, full_name);
CREATE TABLE users (
  user_id INTEGER PRIMARY KEY,
  contact_id INTEGER NOT NULL UNIQUE REFERENCES contacts ON DELETE CASCADE
    DEFERRABLE INITIALLY DEFERRED,
  local_display_name TEXT NOT NULL UNIQUE,
  active_user INTEGER NOT NULL DEFAULT 0, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL), -- 1 for active user
  FOREIGN KEY (user_id, local_display_name)
    REFERENCES display_names (user_id, local_display_name)
    ON DELETE CASCADE
    ON UPDATE CASCADE
    DEFERRABLE INITIALLY DEFERRED
);
CREATE TABLE display_names (
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
  local_display_name TEXT NOT NULL,
  ldn_base TEXT NOT NULL,
  ldn_suffix INTEGER NOT NULL DEFAULT 0, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL),
  PRIMARY KEY (user_id, local_display_name) ON CONFLICT FAIL,
  UNIQUE (user_id, ldn_base, ldn_suffix) ON CONFLICT FAIL
) WITHOUT ROWID;
CREATE TABLE contacts (
  contact_id INTEGER PRIMARY KEY,
  contact_profile_id INTEGER REFERENCES contact_profiles ON DELETE SET NULL, -- NULL if it's an incognito profile
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
  local_display_name TEXT NOT NULL,
  is_user INTEGER NOT NULL DEFAULT 0, -- 1 if this contact is a user
  via_group INTEGER REFERENCES groups (group_id) ON DELETE SET NULL,
  created_at TEXT NOT NULL DEFAULT (datetime('now')), updated_at TEXT CHECK (updated_at NOT NULL), xcontact_id BLOB,
  FOREIGN KEY (user_id, local_display_name)
    REFERENCES display_names (user_id, local_display_name)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  UNIQUE (user_id, local_display_name),
  UNIQUE (user_id, contact_profile_id)
);
CREATE TABLE sent_probes (
  sent_probe_id INTEGER PRIMARY KEY,
  contact_id INTEGER NOT NULL UNIQUE REFERENCES contacts ON DELETE CASCADE,
  probe BLOB NOT NULL,
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL),
  UNIQUE (user_id, probe)
);
CREATE TABLE sent_probe_hashes (
  sent_probe_hash_id INTEGER PRIMARY KEY,
  sent_probe_id INTEGER NOT NULL REFERENCES sent_probes ON DELETE CASCADE,
  contact_id INTEGER NOT NULL REFERENCES contacts ON DELETE CASCADE,
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL),
  UNIQUE (sent_probe_id, contact_id)
);
CREATE TABLE received_probes (
  received_probe_id INTEGER PRIMARY KEY,
  contact_id INTEGER NOT NULL REFERENCES contacts ON DELETE CASCADE,
  probe BLOB,
  probe_hash BLOB NOT NULL,
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE
, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL));
CREATE TABLE known_servers(
  server_id INTEGER PRIMARY KEY,
  host TEXT NOT NULL,
  port TEXT NOT NULL,
  key_hash BLOB,
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL),
  UNIQUE (user_id, host, port)
) WITHOUT ROWID;
CREATE TABLE group_profiles ( -- shared group profiles
  group_profile_id INTEGER PRIMARY KEY,
  display_name TEXT NOT NULL, -- this name must not contain spaces
  full_name TEXT NOT NULL,
  properties TEXT NOT NULL DEFAULT '{}' -- JSON with user or contact profile
, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL), image TEXT, user_id INTEGER DEFAULT NULL REFERENCES users ON DELETE CASCADE);
CREATE TABLE groups (
  group_id INTEGER PRIMARY KEY, -- local group ID
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
  local_display_name TEXT NOT NULL, -- local group name without spaces
  group_profile_id INTEGER REFERENCES group_profiles ON DELETE SET NULL, -- shared group profile
  inv_queue_info BLOB, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL), -- received
  FOREIGN KEY (user_id, local_display_name)
    REFERENCES display_names (user_id, local_display_name)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  UNIQUE (user_id, local_display_name),
  UNIQUE (user_id, group_profile_id)
);
CREATE INDEX idx_groups_inv_queue_info ON groups (inv_queue_info);
CREATE TABLE group_members ( -- group members, excluding the local user
  group_member_id INTEGER PRIMARY KEY,
  group_id INTEGER NOT NULL REFERENCES groups ON DELETE CASCADE,
  member_id BLOB NOT NULL, -- shared member ID, unique per group
  member_role TEXT NOT NULL, -- owner, admin, member
  member_category TEXT NOT NULL, -- see GroupMemberCategory
  member_status TEXT NOT NULL, -- see GroupMemberStatus
  invited_by INTEGER REFERENCES contacts (contact_id) ON DELETE SET NULL, -- NULL for the members who joined before the current user and for the group creator
  sent_inv_queue_info BLOB, -- sent
  group_queue_info BLOB, -- received
  direct_queue_info BLOB, -- received
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
  local_display_name TEXT NOT NULL, -- should be the same as contact
  contact_profile_id INTEGER NOT NULL REFERENCES contact_profiles ON DELETE CASCADE,
  contact_id INTEGER REFERENCES contacts ON DELETE CASCADE, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL),
  FOREIGN KEY (user_id, local_display_name)
    REFERENCES display_names (user_id, local_display_name)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  UNIQUE (group_id, member_id)
);
CREATE TABLE group_member_intros (
  group_member_intro_id INTEGER PRIMARY KEY,
  re_group_member_id INTEGER NOT NULL REFERENCES group_members (group_member_id) ON DELETE CASCADE,
  to_group_member_id INTEGER NOT NULL REFERENCES group_members (group_member_id) ON DELETE CASCADE,
  group_queue_info BLOB,
  direct_queue_info BLOB,
  intro_status TEXT NOT NULL, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL), -- see GroupMemberIntroStatus
  UNIQUE (re_group_member_id, to_group_member_id)
);
CREATE TABLE files (
  file_id INTEGER PRIMARY KEY,
  contact_id INTEGER REFERENCES contacts ON DELETE CASCADE,
  group_id INTEGER REFERENCES groups ON DELETE CASCADE,
  file_name TEXT NOT NULL,
  file_path TEXT,
  file_size INTEGER NOT NULL,
  chunk_size INTEGER NOT NULL,
  created_at TEXT NOT NULL DEFAULT (datetime('now')),
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE
, chat_item_id INTEGER DEFAULT NULL REFERENCES chat_items ON DELETE CASCADE, updated_at TEXT CHECK (updated_at NOT NULL), cancelled INTEGER, ci_file_status TEXT);
CREATE TABLE snd_files (
  file_id INTEGER NOT NULL REFERENCES files ON DELETE CASCADE,
  connection_id INTEGER NOT NULL REFERENCES connections ON DELETE CASCADE,
  file_status TEXT NOT NULL, -- new, accepted, connected, completed
  group_member_id INTEGER REFERENCES group_members ON DELETE CASCADE, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL),
  PRIMARY KEY (file_id, connection_id)
) WITHOUT ROWID;
CREATE TABLE rcv_files (
  file_id INTEGER PRIMARY KEY REFERENCES files ON DELETE CASCADE,
  file_status TEXT NOT NULL, -- new, accepted, connected, completed
  group_member_id INTEGER REFERENCES group_members ON DELETE CASCADE,
  file_queue_info BLOB
, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL));
CREATE TABLE snd_file_chunks (
  file_id INTEGER NOT NULL,
  connection_id INTEGER NOT NULL,
  chunk_number INTEGER NOT NULL,
  chunk_agent_msg_id INTEGER,
  chunk_sent INTEGER NOT NULL DEFAULT 0, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL), -- 0 (sent to agent), 1 (sent to server)
  FOREIGN KEY (file_id, connection_id) REFERENCES snd_files ON DELETE CASCADE,
  PRIMARY KEY (file_id, connection_id, chunk_number)
) WITHOUT ROWID;
CREATE TABLE rcv_file_chunks (
  file_id INTEGER NOT NULL REFERENCES rcv_files ON DELETE CASCADE,
  chunk_number INTEGER NOT NULL,
  chunk_agent_msg_id INTEGER NOT NULL,
  chunk_stored INTEGER NOT NULL DEFAULT 0, created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL), -- 0 (received), 1 (appended to file)
  PRIMARY KEY (file_id, chunk_number)
) WITHOUT ROWID;
CREATE TABLE connections ( -- all SMP agent connections
  connection_id INTEGER PRIMARY KEY,
  agent_conn_id BLOB NOT NULL UNIQUE,
  conn_level INTEGER NOT NULL DEFAULT 0,
  via_contact INTEGER REFERENCES contacts (contact_id) ON DELETE SET NULL,
  conn_status TEXT NOT NULL,
  conn_type TEXT NOT NULL, -- contact, member, rcv_file, snd_file
  user_contact_link_id INTEGER REFERENCES user_contact_links ON DELETE CASCADE,
  contact_id INTEGER REFERENCES contacts ON DELETE CASCADE,
  group_member_id INTEGER REFERENCES group_members ON DELETE CASCADE,
  snd_file_id INTEGER,
  rcv_file_id INTEGER REFERENCES rcv_files (file_id) ON DELETE CASCADE,
  created_at TEXT NOT NULL DEFAULT (datetime('now')),
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE, updated_at TEXT CHECK (updated_at NOT NULL), via_contact_uri_hash BLOB, xcontact_id BLOB,
  FOREIGN KEY (snd_file_id, connection_id)
    REFERENCES snd_files (file_id, connection_id)
    ON DELETE CASCADE
    DEFERRABLE INITIALLY DEFERRED
);
CREATE TABLE user_contact_links (
  user_contact_link_id INTEGER PRIMARY KEY,
  conn_req_contact BLOB NOT NULL,
  local_display_name TEXT NOT NULL DEFAULT '',
  created_at TEXT NOT NULL DEFAULT (datetime('now')),
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE, updated_at TEXT CHECK (updated_at NOT NULL), auto_accept INTEGER DEFAULT 0,
  UNIQUE (user_id, local_display_name)
);
CREATE TABLE contact_requests (
  contact_request_id INTEGER PRIMARY KEY,
  user_contact_link_id INTEGER NOT NULL REFERENCES user_contact_links
    ON UPDATE CASCADE ON DELETE CASCADE,
  agent_invitation_id  BLOB NOT NULL,
  contact_profile_id INTEGER REFERENCES contact_profiles
    ON DELETE SET NULL -- NULL if it's an incognito profile
    DEFERRABLE INITIALLY DEFERRED,
  local_display_name TEXT NOT NULL,
  created_at TEXT NOT NULL DEFAULT (datetime('now')),
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE, updated_at TEXT CHECK (updated_at NOT NULL), xcontact_id BLOB,
  FOREIGN KEY (user_id, local_display_name)
    REFERENCES display_names (user_id, local_display_name)
    ON UPDATE CASCADE
    ON DELETE CASCADE
    DEFERRABLE INITIALLY DEFERRED,
  UNIQUE (user_id, local_display_name),
  UNIQUE (user_id, contact_profile_id)
);
CREATE TABLE messages (
  message_id INTEGER PRIMARY KEY,
  msg_sent INTEGER NOT NULL, -- 0 for received, 1 for sent
  chat_msg_event TEXT NOT NULL, -- message event tag (the constructor of CMEventTag)
  msg_body BLOB, -- agent message body as received or sent
  created_at TEXT NOT NULL DEFAULT (datetime('now'))
, updated_at TEXT CHECK (updated_at NOT NULL), connection_id INTEGER DEFAULT NULL REFERENCES connections ON DELETE CASCADE, group_id INTEGER DEFAULT NULL REFERENCES groups ON DELETE CASCADE, shared_msg_id BLOB, shared_msg_id_user INTEGER);
CREATE TABLE msg_deliveries (
  msg_delivery_id INTEGER PRIMARY KEY,
  message_id INTEGER NOT NULL REFERENCES messages ON DELETE CASCADE, -- non UNIQUE for group messages
  connection_id INTEGER NOT NULL REFERENCES connections ON DELETE CASCADE,
  agent_msg_id INTEGER, -- internal agent message ID (NULL while pending)
  agent_msg_meta TEXT, -- JSON with timestamps etc. sent in MSG, NULL for sent
  chat_ts TEXT NOT NULL DEFAULT (datetime('now')), created_at TEXT CHECK (created_at NOT NULL), updated_at TEXT CHECK (updated_at NOT NULL), -- broker_ts for received, created_at for sent
  UNIQUE (connection_id, agent_msg_id)
);
CREATE TABLE msg_delivery_events (
  msg_delivery_event_id INTEGER PRIMARY KEY,
  msg_delivery_id INTEGER NOT NULL REFERENCES msg_deliveries ON DELETE CASCADE, -- non UNIQUE for multiple events per msg delivery
  delivery_status TEXT NOT NULL, -- see MsgDeliveryStatus for allowed values
  created_at TEXT NOT NULL DEFAULT (datetime('now')), updated_at TEXT CHECK (updated_at NOT NULL),
  UNIQUE (msg_delivery_id, delivery_status)
);
CREATE TABLE pending_group_messages (
  pending_group_message_id INTEGER PRIMARY KEY,
  group_member_id INTEGER NOT NULL REFERENCES group_members ON DELETE CASCADE,
  message_id INTEGER NOT NULL REFERENCES messages ON DELETE CASCADE,
  group_member_intro_id INTEGER REFERENCES group_member_intros ON DELETE CASCADE,
  created_at TEXT NOT NULL DEFAULT (datetime('now')),
  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
);
CREATE TABLE chat_items (
  chat_item_id INTEGER PRIMARY KEY,
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
  contact_id INTEGER REFERENCES contacts ON DELETE CASCADE,
  group_id INTEGER REFERENCES groups ON DELETE CASCADE,
  group_member_id INTEGER REFERENCES group_members ON DELETE SET NULL, -- NULL for sent even if group_id is not
  chat_msg_id INTEGER, -- sent as part of the message that created the item
  created_by_msg_id INTEGER UNIQUE REFERENCES messages (message_id) ON DELETE SET NULL,
  item_sent INTEGER NOT NULL, -- 0 for received, 1 for sent
  item_ts TEXT NOT NULL, -- broker_ts of creating message for received, created_at for sent
  item_deleted INTEGER NOT NULL DEFAULT 0, -- 1 for deleted,
  item_content TEXT NOT NULL, -- JSON
  item_text TEXT NOT NULL, -- textual representation
  created_at TEXT NOT NULL DEFAULT (datetime('now')),
  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
, item_status TEXT CHECK (item_status NOT NULL), shared_msg_id BLOB, quoted_shared_msg_id BLOB, quoted_sent_at TEXT, quoted_content TEXT, quoted_sent INTEGER, quoted_member_id BLOB, item_edited INTEGER);
CREATE TABLE chat_item_messages (
  chat_item_id INTEGER NOT NULL REFERENCES chat_items ON DELETE CASCADE,
  message_id INTEGER NOT NULL UNIQUE REFERENCES messages ON DELETE CASCADE,
  created_at TEXT NOT NULL DEFAULT (datetime('now')),
  updated_at TEXT NOT NULL DEFAULT (datetime('now')),
  UNIQUE (chat_item_id, message_id)
);
CREATE INDEX idx_connections_via_contact_uri_hash ON connections (via_contact_uri_hash);
CREATE INDEX idx_contact_requests_xcontact_id ON contact_requests (xcontact_id);
CREATE INDEX idx_contacts_xcontact_id ON contacts (xcontact_id);
CREATE TABLE smp_servers (
  smp_server_id INTEGER PRIMARY KEY,
  host TEXT NOT NULL,
  port TEXT NOT NULL,
  key_hash BLOB NOT NULL,
  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
  created_at TEXT NOT NULL DEFAULT (datetime('now')),
  updated_at TEXT NOT NULL DEFAULT (datetime('now')),
  UNIQUE (host, port)
);
CREATE INDEX idx_messages_shared_msg_id ON messages (shared_msg_id);
CREATE UNIQUE INDEX idx_messages_direct_shared_msg_id ON messages (connection_id, shared_msg_id_user, shared_msg_id);
CREATE UNIQUE INDEX idx_messages_group_shared_msg_id ON messages (group_id, shared_msg_id_user, shared_msg_id);
CREATE INDEX idx_chat_items_shared_msg_id ON chat_items (shared_msg_id);