diff --git a/src/multi_swarm/persistence/__init__.py b/src/multi_swarm/persistence/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/multi_swarm/persistence/repository.py b/src/multi_swarm/persistence/repository.py
new file mode 100644
index 0000000..4e46c38
--- /dev/null
+++ b/src/multi_swarm/persistence/repository.py
@@ -0,0 +1,235 @@
+from __future__ import annotations
+
+import json
+import sqlite3
+import uuid
+from datetime import UTC, datetime
+from pathlib import Path
+from typing import Any
+
+from ..genome.hypothesis import HypothesisAgentGenome
+from .schema import SCHEMA_SQL
+
+
+class Repository:
+    def __init__(self, db_path: Path | str):
+        self.db_path = Path(db_path)
+
+    def _conn(self) -> sqlite3.Connection:
+        conn = sqlite3.connect(self.db_path, isolation_level=None)
+        conn.row_factory = sqlite3.Row
+        conn.execute("PRAGMA foreign_keys = ON")
+        conn.execute("PRAGMA journal_mode = WAL")
+        return conn
+
+    def init_schema(self) -> None:
+        self.db_path.parent.mkdir(parents=True, exist_ok=True)
+        with self._conn() as conn:
+            conn.executescript(SCHEMA_SQL)
+
+    @staticmethod
+    def _now() -> str:
+        return datetime.now(UTC).isoformat()
+
+    # runs
+    def create_run(self, name: str, config: dict[str, Any]) -> str:
+        rid = uuid.uuid4().hex
+        with self._conn() as conn:
+            conn.execute(
+                "INSERT INTO runs (id, name, started_at, status, config_json) "
+                "VALUES (?,?,?,?,?)",
+                (rid, name, self._now(), "running", json.dumps(config)),
+            )
+        return rid
+
+    def complete_run(
+        self, run_id: str, total_cost: float, status: str = "completed"
+    ) -> None:
+        with self._conn() as conn:
+            conn.execute(
+                "UPDATE runs SET completed_at=?, status=?, total_cost_usd=? WHERE id=?",
+                (self._now(), status, total_cost, run_id),
+            )
+
+    def get_run(self, run_id: str) -> dict[str, Any]:
+        with self._conn() as conn:
+            row = conn.execute("SELECT * FROM runs WHERE id=?", (run_id,)).fetchone()
+        if row is None:
+            raise KeyError(run_id)
+        return dict(row)
+
+    def list_runs(self) -> list[dict[str, Any]]:
+        with self._conn() as conn:
+            rows = conn.execute(
+                "SELECT * FROM runs ORDER BY started_at DESC"
+            ).fetchall()
+        return [dict(r) for r in rows]
+
+    # generations
+    def save_generation_summary(
+        self,
+        run_id: str,
+        generation_idx: int,
+        n_genomes: int,
+        fitness_median: float,
+        fitness_max: float,
+        fitness_p90: float,
+        entropy: float,
+    ) -> None:
+        with self._conn() as conn:
+            conn.execute(
+                """INSERT OR REPLACE INTO generations
+                   (run_id, generation_idx, completed_at, n_genomes,
+                    fitness_median, fitness_max, fitness_p90, entropy)
+                   VALUES (?,?,?,?,?,?,?,?)""",
+                (
+                    run_id,
+                    generation_idx,
+                    self._now(),
+                    n_genomes,
+                    fitness_median,
+                    fitness_max,
+                    fitness_p90,
+                    entropy,
+                ),
+            )
+
+    def list_generations(self, run_id: str) -> list[dict[str, Any]]:
+        with self._conn() as conn:
+            rows = conn.execute(
+                "SELECT * FROM generations WHERE run_id=? ORDER BY generation_idx",
+                (run_id,),
+            ).fetchall()
+        return [dict(r) for r in rows]
+
+    # genomes
+    def save_genome(
+        self, run_id: str, generation_idx: int, genome: HypothesisAgentGenome
+    ) -> None:
+        with self._conn() as conn:
+            conn.execute(
+                "INSERT OR REPLACE INTO genomes "
+                "(id, run_id, generation_idx, payload_json) VALUES (?,?,?,?)",
+                (genome.id, run_id, generation_idx, json.dumps(genome.to_dict())),
+            )
+
+    def list_genomes(
+        self, run_id: str, generation_idx: int | None = None
+    ) -> list[dict[str, Any]]:
+        with self._conn() as conn:
+            if generation_idx is None:
+                rows = conn.execute(
+                    "SELECT * FROM genomes WHERE run_id=? ORDER BY generation_idx, id",
+                    (run_id,),
+                ).fetchall()
+            else:
+                rows = conn.execute(
+                    "SELECT * FROM genomes WHERE run_id=? AND generation_idx=? "
+                    "ORDER BY id",
+                    (run_id, generation_idx),
+                ).fetchall()
+        return [dict(r) for r in rows]
+
+    # evaluations
+    def save_evaluation(
+        self,
+        run_id: str,
+        genome_id: str,
+        fitness: float,
+        dsr: float,
+        dsr_pvalue: float,
+        sharpe: float,
+        max_dd: float,
+        total_return: float,
+        n_trades: int,
+        parse_error: str | None,
+        raw_text: str | None,
+    ) -> None:
+        with self._conn() as conn:
+            conn.execute(
+                """INSERT OR REPLACE INTO evaluations
+                   (run_id, genome_id, fitness, dsr, dsr_pvalue, sharpe, max_dd,
+                    total_return, n_trades, parse_error, raw_text, eval_ts)
+                   VALUES (?,?,?,?,?,?,?,?,?,?,?,?)""",
+                (
+                    run_id,
+                    genome_id,
+                    fitness,
+                    dsr,
+                    dsr_pvalue,
+                    sharpe,
+                    max_dd,
+                    total_return,
+                    n_trades,
+                    parse_error,
+                    raw_text,
+                    self._now(),
+                ),
+            )
+
+    def list_evaluations(self, run_id: str) -> list[dict[str, Any]]:
+        with self._conn() as conn:
+            rows = conn.execute(
+                "SELECT * FROM evaluations WHERE run_id=? ORDER BY fitness DESC",
+                (run_id,),
+            ).fetchall()
+        return [dict(r) for r in rows]
+
+    # cost
+    def save_cost_record(
+        self,
+        run_id: str,
+        agent_id: str,
+        tier: str,
+        input_tokens: int,
+        output_tokens: int,
+        cost_usd: float,
+    ) -> None:
+        with self._conn() as conn:
+            conn.execute(
+                """INSERT INTO cost_records
+                   (run_id, agent_id, ts, tier, input_tokens, output_tokens, cost_usd)
+                   VALUES (?,?,?,?,?,?,?)""",
+                (
+                    run_id,
+                    agent_id,
+                    self._now(),
+                    tier,
+                    input_tokens,
+                    output_tokens,
+                    cost_usd,
+                ),
+            )
+
+    def total_cost(self, run_id: str) -> float:
+        with self._conn() as conn:
+            row = conn.execute(
+                "SELECT COALESCE(SUM(cost_usd), 0.0) AS c FROM cost_records "
+                "WHERE run_id=?",
+                (run_id,),
+            ).fetchone()
+        return float(row["c"])
+
+    # adversarial
+    def save_adversarial_finding(
+        self,
+        run_id: str,
+        genome_id: str,
+        name: str,
+        severity: str,
+        detail: str,
+    ) -> None:
+        with self._conn() as conn:
+            conn.execute(
+                """INSERT INTO adversarial_findings
+                   (run_id, genome_id, name, severity, detail) VALUES (?,?,?,?,?)""",
+                (run_id, genome_id, name, severity, detail),
+            )
+
+    def list_adversarial_findings(self, run_id: str) -> list[dict[str, Any]]:
+        with self._conn() as conn:
+            rows = conn.execute(
+                "SELECT * FROM adversarial_findings WHERE run_id=? ORDER BY id",
+                (run_id,),
+            ).fetchall()
+        return [dict(r) for r in rows]
diff --git a/src/multi_swarm/persistence/schema.py b/src/multi_swarm/persistence/schema.py
new file mode 100644
index 0000000..5b15054
--- /dev/null
+++ b/src/multi_swarm/persistence/schema.py
@@ -0,0 +1,77 @@
+SCHEMA_SQL = """
+CREATE TABLE IF NOT EXISTS runs (
+    id TEXT PRIMARY KEY,
+    name TEXT NOT NULL,
+    started_at TEXT NOT NULL,
+    completed_at TEXT,
+    status TEXT NOT NULL DEFAULT 'running',
+    config_json TEXT NOT NULL,
+    total_cost_usd REAL NOT NULL DEFAULT 0.0
+);
+
+CREATE TABLE IF NOT EXISTS generations (
+    run_id TEXT NOT NULL,
+    generation_idx INTEGER NOT NULL,
+    started_at TEXT,
+    completed_at TEXT,
+    n_genomes INTEGER NOT NULL,
+    fitness_median REAL NOT NULL,
+    fitness_max REAL NOT NULL,
+    fitness_p90 REAL NOT NULL,
+    entropy REAL NOT NULL,
+    PRIMARY KEY (run_id, generation_idx),
+    FOREIGN KEY (run_id) REFERENCES runs(id)
+);
+
+CREATE TABLE IF NOT EXISTS genomes (
+    id TEXT NOT NULL,
+    run_id TEXT NOT NULL,
+    generation_idx INTEGER NOT NULL,
+    payload_json TEXT NOT NULL,
+    PRIMARY KEY (id, run_id, generation_idx),
+    FOREIGN KEY (run_id) REFERENCES runs(id)
+);
+
+CREATE TABLE IF NOT EXISTS evaluations (
+    run_id TEXT NOT NULL,
+    genome_id TEXT NOT NULL,
+    fitness REAL NOT NULL,
+    dsr REAL NOT NULL,
+    dsr_pvalue REAL NOT NULL,
+    sharpe REAL NOT NULL,
+    max_dd REAL NOT NULL,
+    total_return REAL NOT NULL,
+    n_trades INTEGER NOT NULL,
+    parse_error TEXT,
+    raw_text TEXT,
+    eval_ts TEXT NOT NULL,
+    PRIMARY KEY (run_id, genome_id),
+    FOREIGN KEY (run_id) REFERENCES runs(id)
+);
+
+CREATE TABLE IF NOT EXISTS cost_records (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    run_id TEXT NOT NULL,
+    agent_id TEXT NOT NULL,
+    ts TEXT NOT NULL,
+    tier TEXT NOT NULL,
+    input_tokens INTEGER NOT NULL,
+    output_tokens INTEGER NOT NULL,
+    cost_usd REAL NOT NULL,
+    FOREIGN KEY (run_id) REFERENCES runs(id)
+);
+
+CREATE TABLE IF NOT EXISTS adversarial_findings (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    run_id TEXT NOT NULL,
+    genome_id TEXT NOT NULL,
+    name TEXT NOT NULL,
+    severity TEXT NOT NULL,
+    detail TEXT NOT NULL,
+    FOREIGN KEY (run_id) REFERENCES runs(id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_evaluations_fitness ON evaluations(run_id, fitness DESC);
+CREATE INDEX IF NOT EXISTS idx_genomes_generation ON genomes(run_id, generation_idx);
+CREATE INDEX IF NOT EXISTS idx_cost_run ON cost_records(run_id);
+"""
diff --git a/tests/unit/test_repository.py b/tests/unit/test_repository.py
new file mode 100644
index 0000000..e5e347c
--- /dev/null
+++ b/tests/unit/test_repository.py
@@ -0,0 +1,56 @@
+import json
+from pathlib import Path
+
+from multi_swarm.genome.hypothesis import HypothesisAgentGenome, ModelTier
+from multi_swarm.persistence.repository import Repository
+
+
+def make_genome(idx: int) -> HypothesisAgentGenome:
+    return HypothesisAgentGenome(
+        system_prompt=f"p-{idx}", feature_access=["close"], temperature=0.9,
+        top_p=0.95, model_tier=ModelTier.C, lookback_window=100, cognitive_style="x",
+    )
+
+
+def test_repository_creates_schema(tmp_path: Path):
+    repo = Repository(db_path=tmp_path / "runs.db")
+    repo.init_schema()
+    assert (tmp_path / "runs.db").exists()
+
+
+def test_repository_create_run_and_get(tmp_path: Path):
+    repo = Repository(db_path=tmp_path / "runs.db")
+    repo.init_schema()
+    run_id = repo.create_run(name="phase1-test", config={"k": 20})
+    run = repo.get_run(run_id)
+    assert run["name"] == "phase1-test"
+    assert json.loads(run["config_json"])["k"] == 20
+
+
+def test_repository_save_genome_and_evaluation(tmp_path: Path):
+    repo = Repository(db_path=tmp_path / "runs.db")
+    repo.init_schema()
+    run_id = repo.create_run(name="t", config={})
+    g = make_genome(0)
+    repo.save_genome(run_id=run_id, generation_idx=0, genome=g)
+    repo.save_evaluation(
+        run_id=run_id, genome_id=g.id, fitness=0.5, dsr=0.7, dsr_pvalue=0.05,
+        sharpe=1.5, max_dd=0.2, total_return=0.3, n_trades=30,
+        parse_error=None, raw_text="(strategy ...)",
+    )
+    evals = repo.list_evaluations(run_id)
+    assert len(evals) == 1
+    assert evals[0]["fitness"] == 0.5
+
+
+def test_repository_save_generation_summary(tmp_path: Path):
+    repo = Repository(db_path=tmp_path / "runs.db")
+    repo.init_schema()
+    run_id = repo.create_run(name="t", config={})
+    repo.save_generation_summary(
+        run_id=run_id, generation_idx=0, n_genomes=20,
+        fitness_median=0.3, fitness_max=0.8, fitness_p90=0.7, entropy=0.85,
+    )
+    gens = repo.list_generations(run_id)
+    assert len(gens) == 1
+    assert gens[0]["fitness_max"] == 0.8