diff --git a/src/strategy_pythagoras/strategy_pythagoras/backend/schema.py b/src/strategy_pythagoras/strategy_pythagoras/backend/schema.py
new file mode 100644
index 0000000..e68c864
--- /dev/null
+++ b/src/strategy_pythagoras/strategy_pythagoras/backend/schema.py
@@ -0,0 +1,87 @@
+"""Schema SQLite per le tabelle paper-trading della strategia pythagoras.
+
+Owned dal member strategy_pythagoras: il DDL e' standalone rispetto al core,
+e scrive su un database dedicato (state/strategy_pythagoras_paper.db, env
+STRATEGY_PYTHAGORAS_PAPER_DB_PATH) separato dal runs.db del core GA. Pattern
+replicabile per future strategie.
+"""
+
+from __future__ import annotations
+
+import sqlite3
+from pathlib import Path
+
+PAPER_SCHEMA_SQL = """
+CREATE TABLE IF NOT EXISTS paper_trading_runs (
+    id TEXT PRIMARY KEY,
+    name TEXT NOT NULL,
+    started_at TEXT NOT NULL,
+    stopped_at TEXT,
+    status TEXT NOT NULL DEFAULT 'running',
+    initial_capital REAL NOT NULL,
+    config_json TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS paper_trading_positions (
+    paper_run_id TEXT NOT NULL,
+    symbol TEXT NOT NULL,
+    side TEXT NOT NULL,
+    qty REAL NOT NULL,
+    entry_price REAL NOT NULL,
+    entry_ts TEXT NOT NULL,
+    PRIMARY KEY (paper_run_id, symbol),
+    FOREIGN KEY (paper_run_id) REFERENCES paper_trading_runs(id)
+);
+
+CREATE TABLE IF NOT EXISTS paper_trading_trades (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    paper_run_id TEXT NOT NULL,
+    symbol TEXT NOT NULL,
+    side TEXT NOT NULL,
+    qty REAL NOT NULL,
+    entry_price REAL NOT NULL,
+    exit_price REAL NOT NULL,
+    entry_ts TEXT NOT NULL,
+    exit_ts TEXT NOT NULL,
+    pnl REAL NOT NULL,
+    fees REAL NOT NULL,
+    FOREIGN KEY (paper_run_id) REFERENCES paper_trading_runs(id)
+);
+
+CREATE TABLE IF NOT EXISTS paper_trading_equity (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    paper_run_id TEXT NOT NULL,
+    ts TEXT NOT NULL,
+    equity REAL NOT NULL,
+    cash REAL NOT NULL,
+    positions_value REAL NOT NULL,
+    FOREIGN KEY (paper_run_id) REFERENCES paper_trading_runs(id)
+);
+
+CREATE TABLE IF NOT EXISTS paper_trading_ticks (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    paper_run_id TEXT NOT NULL,
+    symbol TEXT NOT NULL,
+    ts TEXT NOT NULL,
+    bar_ts TEXT NOT NULL,
+    close_price REAL NOT NULL,
+    signal TEXT NOT NULL,
+    action_taken TEXT NOT NULL,
+    FOREIGN KEY (paper_run_id) REFERENCES paper_trading_runs(id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_paper_trades_run ON paper_trading_trades(paper_run_id, exit_ts);
+CREATE INDEX IF NOT EXISTS idx_paper_equity_run ON paper_trading_equity(paper_run_id, ts);
+CREATE INDEX IF NOT EXISTS idx_paper_ticks_run ON paper_trading_ticks(paper_run_id, ts);
+"""
+
+
+def init_schema(db_path: Path | str) -> None:
+    """Crea (se mancanti) le tabelle paper_trading_* sul db indicato."""
+    Path(db_path).parent.mkdir(parents=True, exist_ok=True)
+    conn = sqlite3.connect(str(db_path))
+    try:
+        conn.executescript(PAPER_SCHEMA_SQL)
+        conn.commit()
+    finally:
+        conn.close()