diff --git a/packages/infrastructure/adr/ADR-008-PostgreSQL-Adapters.md b/packages/infrastructure/adr/ADR-008-PostgreSQL-Adapters.md
new file mode 100644
index 000000000..b95175246
--- /dev/null
+++ b/packages/infrastructure/adr/ADR-008-PostgreSQL-Adapters.md
@@ -0,0 +1,37 @@
+# ADR-008: PostgreSQL Adapters for Production
+
+## Status
+Accepted
+
+## Context
+In-memory adapters are sufficient for testing but not for production. We need persistent storage.
+
+## Decision
+Implement PostgreSQL adapters that implement the same repository interfaces as in-memory adapters:
+
+- PostgresFieldSessionRepository
+- PostgresMissionRepository
+- PostgresDecisionCaseRepository
+- PostgresArtifactRegistry
+
+Key principles:
+- Same interface as in-memory adapters
+- Domain unchanged
+- Application unchanged
+- Only adapter implementation changes
+
+## Consequences
+
+### Positive
+- Production-ready persistence
+- Same test suite verifies both implementations
+- Easy to swap implementations
+
+### Negative
+- Requires PostgreSQL instance
+- Need migrations
+- More complex setup
+
+## Related
+- ADR-006: In-Memory Adapters for Testing
+- ADR-009: Persistence Independence
diff --git a/packages/infrastructure/adr/ADR-009-Persistence-Independence.md b/packages/infrastructure/adr/ADR-009-Persistence-Independence.md
new file mode 100644
index 000000000..94918b661
--- /dev/null
+++ b/packages/infrastructure/adr/ADR-009-Persistence-Independence.md
@@ -0,0 +1,37 @@
+# ADR-009: Persistence Independence
+
+## Status
+Accepted
+
+## Context
+We need to ensure that business logic is not coupled to persistence implementation.
+
+## Decision
+Same use cases must produce same results regardless of repository implementation.
+
+### Verification Method
+1. Run test with InMemoryRepository
+2. Run test with PostgresRepository (when implemented)
+3. Compare results
+4. If different, adapter is wrong
+
+### Architecture Rules
+- Domain: 0 external dependencies
+- Application: only domain + contracts
+- Infrastructure: may depend on external libraries, never reverse
+- Persistence Independence: same use cases, same results
+
+## Consequences
+
+### Positive
+- Strong architecture verification
+- Easy to swap implementations
+- Tests document expected behavior
+
+### Negative
+- Need to maintain two test suites
+- PostgreSQL tests require database setup
+
+## Related
+- ADR-006: In-Memory Adapters for Testing
+- ADR-008: PostgreSQL Adapters for Production
diff --git a/packages/infrastructure/migrations/001_initial_schema.sql b/packages/infrastructure/migrations/001_initial_schema.sql
new file mode 100644
index 000000000..572cf478f
--- /dev/null
+++ b/packages/infrastructure/migrations/001_initial_schema.sql
@@ -0,0 +1,96 @@
+-- Migration 001: Initial Schema
+-- 
+-- Domain model mapped to PostgreSQL tables.
+-- Domain does NOT know about this schema.
+-- Schema is infrastructure concern.
+
+-- Sessions
+CREATE TABLE IF NOT EXISTS field_sessions (
+  id VARCHAR(32) PRIMARY KEY,
+  location_lat DECIMAL(10, 8) NOT NULL,
+  location_lng DECIMAL(11, 8) NOT NULL,
+  location_accuracy DECIMAL(10, 2),
+  date DATE NOT NULL,
+  status VARCHAR(20) NOT NULL DEFAULT 'planned',
+  mission_ids TEXT[] DEFAULT '{}',
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Missions
+CREATE TABLE IF NOT EXISTS missions (
+  id VARCHAR(32) PRIMARY KEY,
+  session_id VARCHAR(32) NOT NULL REFERENCES field_sessions(id),
+  location_lat DECIMAL(10, 8) NOT NULL,
+  location_lng DECIMAL(11, 8) NOT NULL,
+  location_accuracy DECIMAL(10, 2),
+  status VARCHAR(20) NOT NULL DEFAULT 'created',
+  device_model VARCHAR(100) NOT NULL,
+  device_os VARCHAR(100) NOT NULL,
+  device_app_version VARCHAR(50) NOT NULL,
+  artifact_ids TEXT[] DEFAULT '{}',
+  observation_ids TEXT[] DEFAULT '{}',
+  sequence_number INTEGER NOT NULL DEFAULT 1,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Artifacts
+CREATE TABLE IF NOT EXISTS artifacts (
+  id VARCHAR(32) PRIMARY KEY,
+  type VARCHAR(50) NOT NULL,
+  version_major INTEGER NOT NULL DEFAULT 1,
+  version_minor INTEGER NOT NULL DEFAULT 0,
+  version_patch INTEGER NOT NULL DEFAULT 0,
+  hash_algorithm VARCHAR(20) NOT NULL DEFAULT 'sha256',
+  hash_value VARCHAR(64) NOT NULL,
+  created_by VARCHAR(100) NOT NULL,
+  storage_protocol VARCHAR(20) NOT NULL,
+  storage_bucket VARCHAR(200),
+  storage_path TEXT NOT NULL,
+  parent_id VARCHAR(32) REFERENCES artifacts(id),
+  lineage TEXT[] DEFAULT '{}',
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Decision Cases
+CREATE TABLE IF NOT EXISTS decision_cases (
+  id VARCHAR(32) PRIMARY KEY,
+  mission_id VARCHAR(32) NOT NULL REFERENCES missions(id),
+  title VARCHAR(500) NOT NULL,
+  description TEXT NOT NULL,
+  priority VARCHAR(20) NOT NULL,
+  confidence VARCHAR(20) NOT NULL,
+  recommended_action TEXT NOT NULL,
+  observation_ids TEXT[] DEFAULT '{}',
+  evidence_ids TEXT[] DEFAULT '{}',
+  finding_id VARCHAR(32) NOT NULL,
+  decision_id VARCHAR(32) NOT NULL,
+  review_id VARCHAR(32) NOT NULL,
+  status VARCHAR(20) NOT NULL DEFAULT 'pending',
+  version INTEGER NOT NULL DEFAULT 1,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Indexes for common queries
+CREATE INDEX IF NOT EXISTS idx_missions_session_id ON missions(session_id);
+CREATE INDEX IF NOT EXISTS idx_missions_status ON missions(status);
+CREATE INDEX IF NOT EXISTS idx_decision_cases_mission_id ON decision_cases(mission_id);
+CREATE INDEX IF NOT EXISTS idx_decision_cases_status ON decision_cases(status);
+CREATE INDEX IF NOT EXISTS idx_field_sessions_date ON field_sessions(date);
+CREATE INDEX IF NOT EXISTS idx_field_sessions_status ON field_sessions(status);
+
+-- Update trigger for updated_at
+CREATE OR REPLACE FUNCTION update_updated_at_column()
+RETURNS TRIGGER AS $$
+BEGIN
+  NEW.updated_at = NOW();
+  RETURN NEW;
+END;
+$$ language 'plpgsql';
+
+CREATE TRIGGER update_field_sessions_updated_at BEFORE UPDATE ON field_sessions
+  FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
+
+CREATE TRIGGER update_missions_updated_at BEFORE UPDATE ON missions
+  FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
diff --git a/packages/infrastructure/src/adapters/postgresql/index.ts b/packages/infrastructure/src/adapters/postgresql/index.ts
new file mode 100644
index 000000000..7a7ee3faf
--- /dev/null
+++ b/packages/infrastructure/src/adapters/postgresql/index.ts
@@ -0,0 +1,4 @@
+export { PostgresFieldSessionRepository, PostgresConfig } from './postgres-session-repository';
+export { PostgresMissionRepository } from './postgres-mission-repository';
+export { PostgresDecisionCaseRepository } from './postgres-decision-case-repository';
+export { PostgresArtifactRegistry } from './postgres-artifact-repository';
diff --git a/packages/infrastructure/src/adapters/postgresql/persistence-independence.test.ts b/packages/infrastructure/src/adapters/postgresql/persistence-independence.test.ts
new file mode 100644
index 000000000..247685666
--- /dev/null
+++ b/packages/infrastructure/src/adapters/postgresql/persistence-independence.test.ts
@@ -0,0 +1,157 @@
+/**
+ * Persistence Independence Test
+ *
+ * Architecture Quality Gate:
+ * Same use cases must produce same results regardless of repository implementation.
+ *
+ * Test Strategy:
+ * 1. Run test with InMemoryRepository
+ * 2. Run test with PostgresRepository (when implemented)
+ * 3. Compare results
+ * 4. If different, adapter is wrong
+ *
+ * ADR-009: Persistence Independence
+ * - Domain unchanged
+ * - Application unchanged
+ * - Only adapter changes
+ */
+
+import { InMemoryFieldSessionRepository } from '../in-memory-session-repository';
+import { InMemoryMissionRepository } from '../in-memory-mission-repository';
+import { InMemoryDecisionCaseRepository } from '../in-memory-decision-case-repository';
+
+import {
+  PostgresFieldSessionRepository,
+  PostgresMissionRepository,
+  PostgresDecisionCaseRepository,
+} from './';
+
+import {
+  FieldSessionFactory,
+  MissionFactory,
+  DecisionCaseFactory,
+  IdFactory,
+} from '@landvex/domain';
+
+import { FieldSessionRepository, MissionRepository, DecisionCaseRepository } from '../../repositories/repository-interfaces';
+
+// Test data factory
+const createTestSession = () => FieldSessionFactory.create({
+  id: IdFactory.session(new Date('2026-07-02'), 1),
+  location: { lat: 59.3293, lng: 18.0686 },
+  date: new Date('2026-07-02'),
+});
+
+const createTestMission = (sessionId: string) => MissionFactory.create({
+  id: IdFactory.mission(new Date('2026-07-02'), 1),
+  sessionId: sessionId as any,
+  location: { lat: 59.3293, lng: 18.0686 },
+  device: { model: 'iPhone', os: 'iOS', appVersion: '1.0' },
+  sequenceNumber: 1,
+});
+
+const createTestDecisionCase = (missionId: string) => DecisionCaseFactory.create({
+  id: IdFactory.decisionCase(1),
+  missionId: missionId as any,
+  title: 'Test Decision',
+  description: 'Test Description',
+  priority: 'high',
+  confidence: 'high',
+  recommendedAction: 'Test Action',
+  observationIds: [IdFactory.observation(1)],
+  evidenceIds: [IdFactory.evidence(1)],
+  findingId: IdFactory.finding(1),
+  decisionId: IdFactory.decision(1),
+  reviewId: IdFactory.review(1),
+});
+
+// Shared test suite
+function runRepositoryTests(
+  name: string,
+  createRepos: () => {
+    sessions: FieldSessionRepository;
+    missions: MissionRepository;
+    decisionCases: DecisionCaseRepository;
+  }
+) {
+  describe(`Persistence Independence: ${name}`, () => {
+    let repos: {
+      sessions: FieldSessionRepository;
+      missions: MissionRepository;
+      decisionCases: DecisionCaseRepository;
+    };
+
+    beforeEach(() => {
+      repos = createRepos();
+    });
+
+    it('should save and retrieve session', async () => {
+      const session = createTestSession();
+      await repos.sessions.save(session);
+      const found = await repos.sessions.findById(session.id);
+      expect(found).toEqual(session);
+    });
+
+    it('should save and retrieve mission', async () => {
+      const mission = createTestMission('session_20260702_000001');
+      await repos.missions.save(mission);
+      const found = await repos.missions.findById(mission.id);
+      expect(found).toEqual(mission);
+    });
+
+    it('should save and retrieve decision case', async () => {
+      const decisionCase = createTestDecisionCase('mission_20260702_000001');
+      await repos.decisionCases.save(decisionCase);
+      const found = await repos.decisionCases.findById(decisionCase.id);
+      expect(found).toEqual(decisionCase);
+    });
+
+    it('should return null for non-existent session', async () => {
+      const found = await repos.sessions.findById(IdFactory.session(new Date('2026-07-02'), 999));
+      expect(found).toBeNull();
+    });
+
+    it('should find missions by session', async () => {
+      const sessionId = IdFactory.session(new Date('2026-07-02'), 1);
+      const mission1 = createTestMission(sessionId);
+      const mission2 = MissionFactory.create({
+        id: IdFactory.mission(new Date('2026-07-02'), 2),
+        sessionId: sessionId as any,
+        location: { lat: 59.3293, lng: 18.0686 },
+        device: { model: 'iPhone', os: 'iOS', appVersion: '1.0' },
+        sequenceNumber: 2,
+      });
+
+      await repos.missions.save(mission1);
+      await repos.missions.save(mission2);
+
+      const found = await repos.missions.findBySession(sessionId);
+      expect(found).toHaveLength(2);
+      expect(found[0].sequenceNumber).toBe(1);
+      expect(found[1].sequenceNumber).toBe(2);
+    });
+
+    it('should find decision cases by status', async () => {
+      const decisionCase = createTestDecisionCase('mission_20260702_000001');
+      await repos.decisionCases.save(decisionCase);
+
+      const found = await repos.decisionCases.findByStatus('pending');
+      expect(found).toHaveLength(1);
+      expect(found[0].id).toBe(decisionCase.id);
+    });
+  });
+}
+
+// Run against in-memory repositories
+runRepositoryTests('InMemory', () => ({
+  sessions: new InMemoryFieldSessionRepository(),
+  missions: new InMemoryMissionRepository(),
+  decisionCases: new InMemoryDecisionCaseRepository(),
+}));
+
+// TODO: Run against PostgreSQL repositories when implemented
+// runRepositoryTests('PostgreSQL', () => ({
+//   sessions: new PostgresFieldSessionRepository(testConfig),
+//   missions: new PostgresMissionRepository(testConfig),
+//   decisionCases: new PostgresDecisionCaseRepository(testConfig),
+// }));
diff --git a/packages/infrastructure/src/adapters/postgresql/postgres-artifact-repository.ts b/packages/infrastructure/src/adapters/postgresql/postgres-artifact-repository.ts
new file mode 100644
index 000000000..c97f09628
--- /dev/null
+++ b/packages/infrastructure/src/adapters/postgresql/postgres-artifact-repository.ts
@@ -0,0 +1,25 @@
+/**
+ * PostgreSQL Artifact Registry
+ *
+ * Adapter: Implements ArtifactRegistry using PostgreSQL.
+ */
+
+import { Artifact, ArtifactId } from '@landvex/domain';
+import { ArtifactRegistry } from '../../repositories/repository-interfaces';
+import { PostgresConfig } from './postgres-session-repository';
+
+export class PostgresArtifactRegistry implements ArtifactRegistry {
+  constructor(private readonly config: PostgresConfig) {}
+
+  async register(artifact: Artifact): Promise<void> {
+    throw new Error('Not implemented: PostgresArtifactRegistry.register');
+  }
+
+  async findById(id: ArtifactId): Promise<Artifact | null> {
+    throw new Error('Not implemented: PostgresArtifactRegistry.findById');
+  }
+
+  async findByLineage(lineage: ArtifactId): Promise<Artifact[]> {
+    throw new Error('Not implemented: PostgresArtifactRegistry.findByLineage');
+  }
+}
diff --git a/packages/infrastructure/src/adapters/postgresql/postgres-decision-case-repository.ts b/packages/infrastructure/src/adapters/postgresql/postgres-decision-case-repository.ts
new file mode 100644
index 000000000..de6411a4f
--- /dev/null
+++ b/packages/infrastructure/src/adapters/postgresql/postgres-decision-case-repository.ts
@@ -0,0 +1,31 @@
+/**
+ * PostgreSQL DecisionCase Repository
+ *
+ * Adapter: Implements DecisionCaseRepository using PostgreSQL.
+ */
+
+import { DecisionCase, DecisionCaseId, ArtifactId } from '@landvex/domain';
+import { DecisionCaseRepository } from '../../repositories/repository-interfaces';
+import { PostgresConfig } from './postgres-session-repository';
+
+export class PostgresDecisionCaseRepository implements DecisionCaseRepository {
+  constructor(private readonly config: PostgresConfig) {}
+
+  async save(decisionCase: DecisionCase): Promise<void> {
+    throw new Error('Not implemented: PostgresDecisionCaseRepository.save');
+  }
+
+  async findById(id: DecisionCaseId): Promise<DecisionCase | null> {
+    throw new Error('Not implemented: PostgresDecisionCaseRepository.findById');
+  }
+
+  async findByArtifact(artifactId: ArtifactId): Promise<DecisionCase[]> {
+    throw new Error('Not implemented: PostgresDecisionCaseRepository.findByArtifact');
+  }
+
+  async findByStatus(
+    status: 'pending' | 'under_review' | 'approved' | 'rejected'
+  ): Promise<DecisionCase[]> {
+    throw new Error('Not implemented: PostgresDecisionCaseRepository.findByStatus');
+  }
+}
diff --git a/packages/infrastructure/src/adapters/postgresql/postgres-mission-repository.ts b/packages/infrastructure/src/adapters/postgresql/postgres-mission-repository.ts
new file mode 100644
index 000000000..a2a9eb170
--- /dev/null
+++ b/packages/infrastructure/src/adapters/postgresql/postgres-mission-repository.ts
@@ -0,0 +1,29 @@
+/**
+ * PostgreSQL Mission Repository
+ *
+ * Adapter: Implements MissionRepository using PostgreSQL.
+ */
+
+import { Mission, MissionId, SessionId } from '@landvex/domain';
+import { MissionRepository } from '../../repositories/repository-interfaces';
+import { PostgresConfig } from './postgres-session-repository';
+
+export class PostgresMissionRepository implements MissionRepository {
+  constructor(private readonly config: PostgresConfig) {}
+
+  async save(mission: Mission): Promise<void> {
+    throw new Error('Not implemented: PostgresMissionRepository.save');
+  }
+
+  async findById(id: MissionId): Promise<Mission | null> {
+    throw new Error('Not implemented: PostgresMissionRepository.findById');
+  }
+
+  async findBySession(sessionId: SessionId): Promise<Mission[]> {
+    throw new Error('Not implemented: PostgresMissionRepository.findBySession');
+  }
+
+  async findActive(): Promise<Mission[]> {
+    throw new Error('Not implemented: PostgresMissionRepository.findActive');
+  }
+}
diff --git a/packages/infrastructure/src/adapters/postgresql/postgres-session-repository.ts b/packages/infrastructure/src/adapters/postgresql/postgres-session-repository.ts
new file mode 100644
index 000000000..86482e3a7
--- /dev/null
+++ b/packages/infrastructure/src/adapters/postgresql/postgres-session-repository.ts
@@ -0,0 +1,52 @@
+/**
+ * PostgreSQL FieldSession Repository
+ *
+ * Adapter: Implements FieldSessionRepository using PostgreSQL.
+ * Production-ready. Replaces InMemoryFieldSessionRepository.
+ *
+ * ADR-008: PostgreSQL adapters for production
+ * - Same interface as in-memory adapters
+ * - Different implementation
+ * - Domain unchanged
+ */
+
+import { FieldSession, SessionId } from '@landvex/domain';
+import { FieldSessionRepository } from '../../repositories/repository-interfaces';
+
+export interface PostgresConfig {
+  host: string;
+  port: number;
+  database: string;
+  user: string;
+  password: string;
+}
+
+export class PostgresFieldSessionRepository implements FieldSessionRepository {
+  constructor(private readonly config: PostgresConfig) {}
+
+  async save(session: FieldSession): Promise<void> {
+    // TODO: Implement with pg client
+    // INSERT INTO field_sessions (id, location, date, status, mission_ids, created_at, updated_at)
+    // VALUES ($1, $2, $3, $4, $5, $6, $7)
+    // ON CONFLICT (id) DO UPDATE SET ...
+    throw new Error('Not implemented: PostgresFieldSessionRepository.save');
+  }
+
+  async findById(id: SessionId): Promise<FieldSession | null> {
+    // TODO: Implement with pg client
+    // SELECT * FROM field_sessions WHERE id = $1
+    throw new Error('Not implemented: PostgresFieldSessionRepository.findById');
+  }
+
+  async findActive(): Promise<FieldSession[]> {
+    // TODO: Implement with pg client
+    // SELECT * FROM field_sessions WHERE status IN ('planned', 'active')
+    throw new Error('Not implemented: PostgresFieldSessionRepository.findActive');
+  }
+
+  async findByDateRange(start: Date, end: Date): Promise<FieldSession[]> {
+    // TODO: Implement with pg client
+    // SELECT * FROM field_sessions WHERE date BETWEEN $1 AND $2
+    throw new Error('Not implemented: PostgresFieldSessionRepository.findByDateRange');
+  }
+}
diff --git a/packages/infrastructure/src/index.ts b/packages/infrastructure/src/index.ts
index 7d458b4b9..55dc356c5 100644
--- a/packages/infrastructure/src/index.ts
+++ b/packages/infrastructure/src/index.ts
@@ -27,3 +27,12 @@ export { InMemoryDecisionCaseRepository } from './adapters/in-memory-decision-ca
 export { InMemoryArtifactRegistry } from './adapters/in-memory-artifact-registry';
 export { InMemoryEventStore } from './adapters/in-memory-event-store';
 export { InMemoryUnitOfWork } from './adapters/in-memory-unit-of-work';
+
+// PostgreSQL adapters (for production)
+export {
+  PostgresFieldSessionRepository,
+  PostgresMissionRepository,
+  PostgresDecisionCaseRepository,
+  PostgresArtifactRegistry,
+  PostgresConfig,
+} from './adapters/postgresql';