diff --git a/src/multi_swarm_core/multi_swarm_core/config.py b/src/multi_swarm_core/multi_swarm_core/config.py
index 0ea0ca2..2c20e0f 100644
--- a/src/multi_swarm_core/multi_swarm_core/config.py
+++ b/src/multi_swarm_core/multi_swarm_core/config.py
@@ -6,7 +6,7 @@ in the project root. Required secrets are validated at instantiation time.
 
 from pathlib import Path
 
-from pydantic import Field, SecretStr
+from pydantic import AliasChoices, Field, SecretStr
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
@@ -35,7 +35,24 @@ class Settings(BaseSettings):
     run_name: str = "phase1-spike-001"
     data_dir: Path = Field(default=Path("./data"))
     series_dir: Path = Field(default=Path("./series"))
-    db_path: Path = Field(default=Path("./runs.db"))
+
+    # GA core DB (tabelle universali: runs, generations, genomes, evaluations, ...)
+    # Alias DB_PATH legacy mantenuto per backcompat (deprecato, rimuovere nei prossimi cicli).
+    ga_db_path: Path = Field(
+        default=Path("./state/runs.db"),
+        validation_alias=AliasChoices("GA_DB_PATH", "DB_PATH"),
+    )
+
+    # DB per la strategia crypto (tabelle paper_trading_*, isolato dal core)
+    strategy_crypto_db_path: Path = Field(
+        default=Path("./state/strategy_crypto.db"),
+        validation_alias="STRATEGY_CRYPTO_DB_PATH",
+    )
+
+    @property
+    def db_path(self) -> Path:
+        """Backcompat alias: legge ga_db_path. Deprecato — usare ga_db_path."""
+        return self.ga_db_path
 
 
 def load_settings() -> Settings:
diff --git a/src/multi_swarm_core/multi_swarm_core/paper_trading/__init__.py b/src/multi_swarm_core/multi_swarm_core/paper_trading/__init__.py
deleted file mode 100644
index e69de29..0000000
diff --git a/src/strategy_crypto/strategy_crypto/backend/__init__.py b/src/strategy_crypto/strategy_crypto/backend/__init__.py
index e69de29..3d071d1 100644
--- a/src/strategy_crypto/strategy_crypto/backend/__init__.py
+++ b/src/strategy_crypto/strategy_crypto/backend/__init__.py
@@ -0,0 +1,23 @@
+"""Backend paper-trading per la strategia crypto.
+
+Espone le classi principali per import ergonomici in scripts/runner:
+
+    from strategy_crypto.backend import PaperExecutor, Portfolio, PaperRepository
+
+Per i tipi interni (TickResult, OpenPosition, Trade) importare dal sotto-modulo.
+"""
+
+from .executor import PaperExecutor, TickResult
+from .persistence import PaperRepository
+from .portfolio import OpenPosition, Portfolio
+from .schema import PAPER_SCHEMA_SQL, init_schema
+
+__all__ = [
+    "PAPER_SCHEMA_SQL",
+    "OpenPosition",
+    "PaperExecutor",
+    "PaperRepository",
+    "Portfolio",
+    "TickResult",
+    "init_schema",
+]
diff --git a/src/multi_swarm_core/multi_swarm_core/paper_trading/executor.py b/src/strategy_crypto/strategy_crypto/backend/executor.py
similarity index 94%
rename from src/multi_swarm_core/multi_swarm_core/paper_trading/executor.py
rename to src/strategy_crypto/strategy_crypto/backend/executor.py
index dbbd32c..524f26e 100644
--- a/src/multi_swarm_core/multi_swarm_core/paper_trading/executor.py
+++ b/src/strategy_crypto/strategy_crypto/backend/executor.py
@@ -20,9 +20,10 @@ from pathlib import Path
 
 import pandas as pd  # type: ignore[import-untyped]
 
-from ..backtest.orders import Side, Trade
-from ..protocol.compiler import compile_strategy
-from ..protocol.parser import parse_strategy
+from multi_swarm_core.backtest.orders import Side, Trade
+from multi_swarm_core.protocol.compiler import compile_strategy
+from multi_swarm_core.protocol.parser import parse_strategy
+
 from .portfolio import OpenPosition, Portfolio
 
 
diff --git a/src/multi_swarm_core/multi_swarm_core/paper_trading/persistence.py b/src/strategy_crypto/strategy_crypto/backend/persistence.py
similarity index 88%
rename from src/multi_swarm_core/multi_swarm_core/paper_trading/persistence.py
rename to src/strategy_crypto/strategy_crypto/backend/persistence.py
index b58c620..7d08987 100644
--- a/src/multi_swarm_core/multi_swarm_core/paper_trading/persistence.py
+++ b/src/strategy_crypto/strategy_crypto/backend/persistence.py
@@ -1,5 +1,9 @@
-"""Persistenza paper-trading: usa lo stesso ``runs.db`` con tabelle dedicate
-``paper_trading_*`` (vedi :mod:`multi_swarm_core.persistence.schema`).
+"""Persistenza paper-trading: scrive su un DB dedicato (state/strategy_crypto.db)
+con le tabelle ``paper_trading_*`` definite localmente in :mod:`.schema`.
+
+Il DB e' isolato dal ``runs.db`` del core GA: nessun naming conflict con
+future strategie (state/strategy_<asset>.db), nessuna contention di lock
+fra writer GA e writer paper.
 """
 
 from __future__ import annotations
@@ -13,12 +17,17 @@ from typing import Any
 
 from .executor import TickResult
 from .portfolio import Portfolio
+from .schema import init_schema as _init_paper_schema
 
 
 class PaperRepository:
     def __init__(self, db_path: Path | str):
         self.db_path = Path(db_path)
 
+    def init_schema(self) -> None:
+        """Crea (se mancanti) le tabelle paper_trading_* su ``self.db_path``."""
+        _init_paper_schema(self.db_path)
+
     def _conn(self) -> sqlite3.Connection:
         conn = sqlite3.connect(self.db_path, isolation_level=None)
         conn.row_factory = sqlite3.Row
diff --git a/src/multi_swarm_core/multi_swarm_core/paper_trading/portfolio.py b/src/strategy_crypto/strategy_crypto/backend/portfolio.py
similarity index 98%
rename from src/multi_swarm_core/multi_swarm_core/paper_trading/portfolio.py
rename to src/strategy_crypto/strategy_crypto/backend/portfolio.py
index 4b99bfa..8945958 100644
--- a/src/multi_swarm_core/multi_swarm_core/paper_trading/portfolio.py
+++ b/src/strategy_crypto/strategy_crypto/backend/portfolio.py
@@ -17,7 +17,7 @@ from __future__ import annotations
 from dataclasses import dataclass, field
 from datetime import datetime
 
-from ..backtest.orders import Side, Trade
+from multi_swarm_core.backtest.orders import Side, Trade
 
 
 @dataclass(frozen=True)