arcadic 0.1.0

First public release of Arcadic — a lean, framework-agnostic Elixir client for ArcadeDB over the HTTP Cypher command API, with an optional Bolt transport for the query hot path.

• 📦 Hex: https://hex.pm/packages/arcadic/0.1.0
• 📖 Docs: https://hexdocs.pm/arcadic/0.1.0
• ▶️ Interactive getting-started Livebook

Added

• Arcadic.Conn — pure-data connection handle (redacting Inspect) and
  Arcadic.connect/3 / Arcadic.with_database/2 to build and derive handles.
• Arcadic.query/4 + query!/4 (idempotent read endpoint) and
  Arcadic.command/4 + command!/4 (write endpoint), params-only ($name),
  Cypher-default with SQL/Gremlin/GraphQL/Mongo/SQLScript opt-in.
• Arcadic.command_async/4 — fire-and-forget write (server enqueues, returns
  :ok on HTTP 202).
• Session transactions: Arcadic.transaction/3 (commit on return, reraise on
  exception) and Arcadic.rollback/2 (intentional abort → {:error, reason}).
• Arcadic.Server — server admin: create_database/2 (+ !), drop_database/2
  (+ !), database_exists?/2, list_databases/1, ready?/1.
• Arcadic.Error / Arcadic.TransportError — typed error taxonomy with
  boundary redaction (quarantined detail, value-free reasons).
• Arcadic.Transport — the transport behaviour seam, with the default
  Arcadic.Transport.HTTP (Req/Finch) implementation.
• Arcadic.Telemetry — value-free :telemetry.span/3 spans (no statement,
  params, values, or database name).
• Arcadic.Identifier — allowlist identifier validation.
• Migration runner: Arcadic.Migration (behaviour), Arcadic.MigrationRegistry
  (use + migrations [...]), and Arcadic.Migrator (migrate/2, status/2,
  rollback/3, reset/2, pending_migrations/2), tracking applied versions in
  _arcadic_migrations.
• Arcadic.Transport.Bolt — optional Bolt transport (Bolt v4, non-TLS scheme)
  via the optional boltx dependency; server admin remains HTTP-only.
• Arcadic.query_stream/4 — Bolt-only lazy Stream.t() of raw row maps, chunked
  over Bolt PULL/has_more (default chunk_size: 1000); a :timeout opt bounds
  each RUN/PULL receive (default :infinity), raising
  %Arcadic.TransportError{reason: :timeout} on breach; guarded off HTTP and inside
  transactions with a typed :not_supported.
• Arcadic.Transport.Bolt.setup/1 — single-source transport_options builder
  ([bolt: pool, bolt_opts: opts]).
• Arcadic.Telemetry.event/3 — allowlist-validated manual telemetry for lazy ops;
  [:arcadic, :query_stream, :start | :stop] events (value-free).

Fixed

• Arcadic.Transport.Bolt now threads conn.database into every Bolt RUN/BEGIN, so
  with_database/2 selects the database on Bolt (was hitting the connection default).
• Bolt transaction/3 maps a commit-failure to a typed %Arcadic.Error{reason: :transaction_error} instead of leaking DBConnection's bare :rollback atom.
• Arcadic.Transport.Bolt — a failed Bolt connect (wrong password, or a Bolt conn
  pointed at a non-Bolt port) no longer leaks a :gen_tcp socket. arcadic now owns the
  connect handshake and HELLO on both the per-stream connection and the DBConnection
  pool, closing the socket on every failure; a bad-password stream connect surfaces
  :unauthorized, and the connect HELLO is bounded by connect_timeout. Connect-time
  errors are redacted on both sites: a HELLO response arcadic's parser cannot classify
  returns a value-free :bolt_protocol_error instead of a raw exception carrying server
  bytes, and the DBConnection pool's connect error drops the server-supplied failure
  message (keeping the error code/class) so it cannot ride a connect-failure log line.