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<h1 id="public-api-contract">Public API Contract<a class="headerlink" href="#public-api-contract" title="Permanent link">¶</a></h1>
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<p>mt5cli is the generic MT5 data and execution infrastructure layer for downstream
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Python applications. The intended dependency direction is:</p>
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<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>downstream app -> mt5cli -> pdmt5 -> MetaTrader 5
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</code></pre></div>
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<p>Downstream packages should import from the package root (<code>from mt5cli import
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...</code>) and treat the symbols listed below as the stable SDK contract. CLI
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commands mirror the same behavior but are not importable Python APIs.</p>
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<h2 id="stable-downstream-sdk-api">Stable downstream SDK API<a class="headerlink" href="#stable-downstream-sdk-api" title="Permanent link">¶</a></h2>
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<p>These names are exported from <code>mt5cli</code> and covered by the contract in
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<code>mt5cli.STABLE_SDK_EXPORTS</code> (defined in <code>mt5cli.contract</code>). Prefer <code>MT5Client</code> over the legacy <code>Mt5CliClient</code>
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alias for new code.</p>
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<h3 id="session-lifecycle-and-configuration">Session lifecycle and configuration<a class="headerlink" href="#session-lifecycle-and-configuration" title="Permanent link">¶</a></h3>
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<table>
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<thead>
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<tr>
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<th>Symbol</th>
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<th>Role</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>MT5Client</code>, <code>Mt5CliClient</code></td>
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<td>Read-only data client with optional <code>order_check</code> / <code>order_send</code></td>
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</tr>
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<tr>
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<td><code>build_config</code></td>
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<td>Build <code>pdmt5.Mt5Config</code> from connection fields</td>
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</tr>
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<tr>
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<td><code>mt5_session</code></td>
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<td>Context manager: initialize, login, yield client, shutdown</td>
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</tr>
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<tr>
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<td><code>create_trading_client</code>, <code>mt5_trading_session</code></td>
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<td>Trading-capable <code>pdmt5.Mt5TradingClient</code> lifecycle</td>
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</tr>
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<tr>
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<td><code>AccountSpec</code></td>
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<td>Generic account group: symbols plus optional credentials</td>
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</tr>
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<tr>
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<td><code>resolve_account_spec</code>, <code>resolve_account_specs</code></td>
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<td>Merge overrides and expand <code>${ENV_VAR}</code> placeholders; opt-in <code>allow_whole_dollar_env</code> for bare <code>$NAME</code></td>
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</tr>
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<tr>
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<td><code>substitute_env_placeholders</code></td>
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<td>Replace <code>${NAME}</code> substrings from the environment; opt-in <code>allow_whole_dollar_env</code> for whole-value <code>$NAME</code></td>
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</tr>
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</tbody>
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</table>
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<p>Credential resolution is generic: any environment variable name may appear inside
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<code>${...}</code>. mt5cli does not hard-code application-specific keys such as
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<code>mt5_login</code> or <code>mt5_exe</code>.</p>
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<p>Pass <code>allow_whole_dollar_env=True</code> to <code>substitute_env_placeholders()</code>,
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<code>resolve_account_spec()</code>, <code>resolve_account_specs()</code>, and <code>build_config()</code> to
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additionally expand strings whose entire value is a bare <code>$ENV_NAME</code> identifier.
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Partial strings such as <code>"plan$pass"</code>, <code>"abc$ENV"</code>, or <code>"$ENV-suffix"</code> are
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<strong>never</strong> expanded — only an exact <code>$IDENTIFIER</code> whole-string match qualifies.
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Default is <code>False</code> to preserve backward compatibility.</p>
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<h3 id="read-only-mt5-data-access">Read-only MT5 data access<a class="headerlink" href="#read-only-mt5-data-access" title="Permanent link">¶</a></h3>
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<p>Module-level helpers open a transient connection per call. Prefer <code>mt5_session</code>
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or <code>MT5Client</code> when making many requests in one process.</p>
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<table>
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<thead>
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<tr>
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<th>Area</th>
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<th>Symbols</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Rates</td>
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<td><code>copy_rates_from</code>, <code>copy_rates_from_pos</code>, <code>copy_rates_range</code>, <code>latest_rates</code>, <code>collect_latest_rates</code></td>
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</tr>
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<tr>
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<td>Ticks</td>
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<td><code>copy_ticks_from</code>, <code>copy_ticks_range</code>, <code>recent_ticks</code></td>
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</tr>
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<tr>
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<td>Account / terminal</td>
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<td><code>account_info</code>, <code>terminal_info</code>, <code>mt5_version</code>, <code>last_error</code>, <code>mt5_summary</code>, <code>mt5_summary_as_df</code></td>
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</tr>
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<tr>
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<td>Symbols / market</td>
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<td><code>symbols</code>, <code>symbol_info</code>, <code>symbol_info_tick</code>, <code>market_book</code>, <code>minimum_margins</code></td>
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</tr>
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<tr>
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<td>Trading state (read)</td>
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<td><code>orders</code>, <code>positions</code>, <code>history_orders</code>, <code>history_deals</code>, <code>recent_history_deals</code></td>
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</tr>
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</tbody>
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</table>
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<p>Use <code>mt5_version</code> for MetaTrader 5 terminal version data. The name <code>version</code> at
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the package root refers to <code>importlib.metadata.version</code> (package metadata), not
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the MT5 SDK helper.</p>
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<h3 id="closed-bar-rate-helpers">Closed-bar rate helpers<a class="headerlink" href="#closed-bar-rate-helpers" title="Permanent link">¶</a></h3>
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<p>MetaTrader 5 returns the still-forming bar as the last row when
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<code>start_pos=0</code>. Use these helpers instead of reimplementing bar trimming or
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timestamp normalization in downstream apps.</p>
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<table>
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<thead>
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<tr>
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<th>Symbol</th>
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<th>Role</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>drop_forming_rate_bar</code></td>
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<td>Remove the last row from chronologically ordered rate data</td>
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</tr>
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<tr>
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<td><code>fetch_latest_closed_rates</code></td>
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<td>Single connected client: fetch <code>count + 1</code>, drop forming bar</td>
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</tr>
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<tr>
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<td><code>fetch_latest_closed_rates_for_trading_client</code></td>
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<td>Closed bars from an active <code>Mt5TradingClient</code> session; returns RangeIndex</td>
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</tr>
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<tr>
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<td><code>fetch_latest_closed_rates_indexed</code></td>
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<td>Same as above but returns a UTC <code>DatetimeIndex</code> named <code>"time"</code> (no time column)</td>
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</tr>
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<tr>
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<td><code>collect_latest_closed_rates_for_accounts</code></td>
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<td>Multi-account closed bars with optional retry wrapper</td>
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</tr>
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<tr>
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<td><code>collect_latest_closed_rates_by_granularity</code></td>
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<td>Same data keyed by <code>(symbol, granularity_name)</code></td>
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</tr>
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<tr>
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<td><code>collect_latest_rates_for_accounts</code></td>
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<td>Latest bars including the forming bar when <code>start_pos=0</code></td>
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</tr>
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<tr>
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<td><code>collect_latest_rates_for_accounts_with_retries</code></td>
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<td>Bounded exponential backoff for transient MT5 errors</td>
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</tr>
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</tbody>
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</table>
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<h3 id="sqlite-history-collection-and-rate-loading">SQLite history collection and rate loading<a class="headerlink" href="#sqlite-history-collection-and-rate-loading" title="Permanent link">¶</a></h3>
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<table>
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<thead>
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<tr>
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<th>Symbol</th>
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<th>Role</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>collect_history</code></td>
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<td>One-shot date-range export into SQLite</td>
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</tr>
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<tr>
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<td><code>update_history</code>, <code>update_history_with_config</code></td>
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<td>Incremental append from <code>MAX(time)</code> cursors</td>
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</tr>
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<tr>
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<td><code>ThrottledHistoryUpdater</code></td>
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<td>Minimum interval between successful incremental updates; optional <code>update_backend</code> injection</td>
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</tr>
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<tr>
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<td><code>resolve_history_datasets</code>, <code>resolve_history_timeframes</code>, <code>resolve_history_tick_flags</code></td>
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<td>History pipeline configuration</td>
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</tr>
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<tr>
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<td><code>build_rate_view_name</code>, <code>resolve_rate_table_name</code>, <code>resolve_rate_view_name</code>, <code>resolve_rate_view_names</code>, <code>resolve_rate_tables</code></td>
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<td>Map symbols/timeframes to mt5cli-managed table or view names</td>
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</tr>
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<tr>
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<td><code>RateTarget</code>, <code>build_rate_targets</code></td>
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<td>Neutral <code>(symbol, timeframe)</code> series descriptors</td>
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</tr>
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<tr>
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<td><code>load_rate_data</code>, <code>load_rate_data_from_connection</code></td>
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<td>Load one table/view into a time-indexed DataFrame</td>
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</tr>
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<tr>
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<td><code>load_rate_series_from_sqlite</code>, <code>load_rate_series_by_granularity</code></td>
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<td>Load one or many series; fail clearly when managed views are missing</td>
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</tr>
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</tbody>
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</table>
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<p>Pass <code>require_existing=True</code> to rate view resolution helpers when downstream
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code must fail instead of receiving a best-guess view name. Multi-series loaders
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require existing managed <code>rate_*__*</code> views unless <code>explicit_tables</code> is supplied.</p>
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<p>See <a href="../history/">History Collection (SQLite)</a> for schema, view naming, and ER
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diagrams.</p>
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<h3 id="trading-and-sizing-primitives-generic">Trading and sizing primitives (generic)<a class="headerlink" href="#trading-and-sizing-primitives-generic" title="Permanent link">¶</a></h3>
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<p>These helpers implement broker-facing calculations only. They do not encode
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strategy entries, exits, Kelly sizing, or signal logic.</p>
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<table>
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<thead>
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<tr>
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<th>Symbol</th>
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<th>Role</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>get_account_snapshot</code>, <code>get_symbol_snapshot</code>, <code>get_tick_snapshot</code>, <code>get_positions_frame</code></td>
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<td>Normalized account/symbol/tick/position views</td>
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</tr>
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<tr>
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<td><code>detect_position_side</code></td>
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<td>Net long / short / flat from open positions</td>
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</tr>
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<tr>
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<td><code>calculate_spread_ratio</code></td>
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<td>Relative bid-ask spread</td>
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</tr>
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<tr>
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<td><code>calculate_margin_and_volume</code>, <code>calculate_volume_by_margin</code>, <code>calculate_new_position_margin_ratio</code></td>
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<td>Margin budget and volume sizing</td>
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</tr>
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<tr>
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<td><code>normalize_order_volume</code>, <code>estimate_order_margin</code>, <code>calculate_positions_margin</code></td>
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<td>Broker volume normalization and margin totals</td>
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</tr>
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<tr>
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<td><code>calculate_positions_margin_by_symbol</code></td>
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<td>Per-symbol margin map (resilient, first-seen order)</td>
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</tr>
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<tr>
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<td><code>calculate_positions_margin_safe</code></td>
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<td>Summed total margin across symbols (failed symbols skipped)</td>
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</tr>
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<tr>
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<td><code>determine_order_limits</code></td>
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<td>SL/TP price levels from ratios</td>
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</tr>
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<tr>
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<td><code>ensure_symbol_selected</code></td>
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<td>Select/verify Market Watch visibility</td>
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</tr>
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<tr>
|
|
<td><code>place_market_order</code>, <code>close_open_positions</code>, <code>update_sltp_for_open_positions</code></td>
|
|
<td>Order execution helpers (<code>dry_run</code> supported)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>MarginVolume</code>, <code>OrderLimits</code>, <code>OrderExecutionResult</code></td>
|
|
<td>Typed return contracts for order helpers</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>OrderSide</code>, <code>OrderFillingMode</code>, <code>OrderTimeMode</code>, <code>PositionSide</code>, <code>ExecutionStatus</code></td>
|
|
<td>Typed enums for order helpers</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p><code>MT5Client.order_send()</code> and CLI <code>order-send --yes</code> are live execution paths.</p>
|
|
<p>Order helpers validate broker stop-level distance in <code>determine_order_limits()</code> and
|
|
raise <code>Mt5TradingError</code> when computed SL/TP prices are too close to the entry
|
|
quote. Validation uses <code>trade_stops_level * point</code> from the current quote and
|
|
symbol metadata as a pre-check only; it does not guarantee live order acceptance
|
|
after price movement and does not inspect <code>trade_freeze_level</code>. Live
|
|
<code>place_market_order()</code> and SL/TP updates call
|
|
<code>ensure_symbol_selected()</code> so hidden symbols are added to Market Watch before
|
|
sending requests. Failed, malformed, or unknown broker retcodes are fail-closed
|
|
and returned as <code>status="failed"</code> with normalized <code>request</code> / <code>response</code> details;
|
|
<code>dry_run=True</code> never calls <code>ensure_symbol_selected()</code> or <code>order_send()</code>.</p>
|
|
<h3 id="errors-and-mt5-type-re-exports">Errors and MT5 type re-exports<a class="headerlink" href="#errors-and-mt5-type-re-exports" title="Permanent link">¶</a></h3>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Symbol</th>
|
|
<th>Role</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td><code>Mt5CliError</code>, <code>Mt5ConnectionError</code>, <code>Mt5OperationError</code>, <code>Mt5SchemaError</code></td>
|
|
<td>Stable mt5cli exception types</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>normalize_mt5_exception</code>, <code>call_with_normalized_errors</code>, <code>is_recoverable_mt5_error</code></td>
|
|
<td>Error normalization and retry classification</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>Mt5Config</code>, <code>Mt5RuntimeError</code>, <code>Mt5TradingClient</code>, <code>Mt5TradingError</code></td>
|
|
<td>Re-exported pdmt5 types for adapter convenience</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<h3 id="additional-public-exports-secondary">Additional public exports (secondary)<a class="headerlink" href="#additional-public-exports-secondary" title="Permanent link">¶</a></h3>
|
|
<p>The package root also exports schema, storage, and parsing helpers (for example
|
|
<code>DataKind</code>, <code>Dataset</code>, <code>normalize_dataframe</code>, <code>export_dataframe</code>,
|
|
<code>parse_timeframe</code>, <code>TIMEFRAME_MAP</code>). These are public but oriented toward export
|
|
pipelines and advanced integration. Prefer the stable symbols above for core
|
|
infrastructure.</p>
|
|
<h2 id="cli-commands">CLI commands<a class="headerlink" href="#cli-commands" title="Permanent link">¶</a></h2>
|
|
<p>The Typer application in <code>mt5cli.cli</code> exposes file-export commands documented in
|
|
<a href="../cli/">CLI Module</a> and the project README. CLI commands:</p>
|
|
<ul>
|
|
<li>Require <code>-o/--output</code> and write CSV, JSON, Parquet, or SQLite.</li>
|
|
<li>Accept global MT5 connection options (<code>--login</code>, <code>--password</code>, <code>--server</code>,
|
|
<code>--path</code>, <code>--timeout</code>).</li>
|
|
<li>Delegate to the same Python APIs described here; they are not duplicated
|
|
business logic.</li>
|
|
</ul>
|
|
<p><code>order-send</code> requires <code>--yes</code> before placing live trades.</p>
|
|
<h2 id="internal-helpers-not-stable">Internal helpers (not stable)<a class="headerlink" href="#internal-helpers-not-stable" title="Permanent link">¶</a></h2>
|
|
<p>Do not import these for downstream contracts; they may change without a semver
|
|
notice:</p>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Module</th>
|
|
<th>Examples</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td><code>mt5cli.sdk</code></td>
|
|
<td><code>connected_client</code>, <code>_run_with_client</code>, private coercion helpers</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>mt5cli.history</code></td>
|
|
<td><code>write_*_dataset</code>, <code>deduplicate_history_tables</code>, <code>parse_sqlite_timestamp</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>mt5cli.retry</code></td>
|
|
<td><code>retry_with_backoff</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>mt5cli.cli</code></td>
|
|
<td>Typer command handlers and Click parameter types</td>
|
|
</tr>
|
|
<tr>
|
|
<td>Leading-underscore names</td>
|
|
<td>Any <code>_</code>-prefixed function or method</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>Use the package-root stable exports instead of reaching into submodule
|
|
internals.</p>
|
|
<h2 id="explicitly-out-of-scope">Explicitly out of scope<a class="headerlink" href="#explicitly-out-of-scope" title="Permanent link">¶</a></h2>
|
|
<p>mt5cli must <strong>not</strong> implement downstream strategy or research responsibilities.
|
|
The following belong in consuming applications, not in mt5cli:</p>
|
|
<ul>
|
|
<li>Signal detection (for example AR-GARCH or other model-specific triggers)</li>
|
|
<li>Backtesting, walk-forward analysis, or parameter optimization</li>
|
|
<li>Strategy-specific risk policy, position sizing systems, or Kelly fractions</li>
|
|
<li>Entry/exit decision logic or YAML strategy semantics</li>
|
|
<li>Application-specific credential schema keys wired into mt5cli internals</li>
|
|
</ul>
|
|
<p>mt5cli provides connection lifecycle, normalized data access, SQLite history
|
|
machinery, closed-bar helpers, generic margin/volume/spread/SL/TP utilities, and
|
|
optional order primitives so downstream apps can focus on strategy code behind
|
|
their own adapter layer.</p>
|
|
<h2 id="contract-verification">Contract verification<a class="headerlink" href="#contract-verification" title="Permanent link">¶</a></h2>
|
|
<p><code>tests/test_contracts.py</code> asserts that every name in <code>STABLE_SDK_EXPORTS</code> is
|
|
importable from <code>mt5cli</code>, documents key closed-bar, rate-view, SQLite loading,
|
|
account-resolution, and trading-session behaviors, and keeps the contract set
|
|
aligned with <code>__all__</code>.</p></div>
|
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