diff --git a/internal/store/crud_test.go b/internal/store/crud_test.go
new file mode 100644
index 0000000..b4afe6a
--- /dev/null
+++ b/internal/store/crud_test.go
@@ -0,0 +1,193 @@
+package store_test
+
+import (
+	"context"
+	"encoding/json"
+	"testing"
+
+	"github.com/netcell-it/deklarix/internal/store"
+)
+
+func openTestStore(t *testing.T) *store.Store {
+	t.Helper()
+	url := testDatabaseURL(t)
+	if err := store.Migrate(url); err != nil {
+		t.Fatalf("Migrate: %v", err)
+	}
+	s, err := store.Open(context.Background(), url)
+	if err != nil {
+		t.Fatalf("Open: %v", err)
+	}
+	t.Cleanup(s.Close)
+	return s
+}
+
+func TestSubmissionCRUD(t *testing.T) {
+	s := openTestStore(t)
+	ctx := context.Background()
+
+	created, err := s.CreateSubmission(ctx, "instagram", "reel", "Werbung fuer ein Produkt")
+	if err != nil {
+		t.Fatalf("CreateSubmission: %v", err)
+	}
+	if created.Status != "draft" {
+		t.Fatalf("Status = %q, want draft", created.Status)
+	}
+
+	got, err := s.GetSubmission(ctx, created.ID)
+	if err != nil {
+		t.Fatalf("GetSubmission: %v", err)
+	}
+	if got.Platform != "instagram" || got.Caption != "Werbung fuer ein Produkt" {
+		t.Fatalf("GetSubmission = %+v, unerwartete Werte", got)
+	}
+
+	if err := s.SetSubmissionStatus(ctx, created.ID, "checked"); err != nil {
+		t.Fatalf("SetSubmissionStatus: %v", err)
+	}
+	got, err = s.GetSubmission(ctx, created.ID)
+	if err != nil {
+		t.Fatalf("GetSubmission nach Statuswechsel: %v", err)
+	}
+	if got.Status != "checked" {
+		t.Fatalf("Status nach SetSubmissionStatus = %q, want checked", got.Status)
+	}
+}
+
+func TestGetSubmissionNotFound(t *testing.T) {
+	s := openTestStore(t)
+	if _, err := s.GetSubmission(context.Background(), "00000000-0000-0000-0000-000000000000"); err == nil {
+		t.Fatal("expected error for a nonexistent submission, got nil")
+	}
+}
+
+func TestSetSubmissionStatusNotFound(t *testing.T) {
+	s := openTestStore(t)
+	err := s.SetSubmissionStatus(context.Background(), "00000000-0000-0000-0000-000000000000", "checked")
+	if err == nil {
+		t.Fatal("expected error when updating a nonexistent submission, got nil")
+	}
+}
+
+func TestExtractionCRUD(t *testing.T) {
+	s := openTestStore(t)
+	ctx := context.Background()
+
+	sub, err := s.CreateSubmission(ctx, "tiktok", "video", "...")
+	if err != nil {
+		t.Fatalf("CreateSubmission: %v", err)
+	}
+
+	payload := []byte(`{"gegenleistung":"bezahlt"}`)
+	ext, err := s.CreateExtraction(ctx, sub.ID, payload, "claude-sonnet-5", "v1")
+	if err != nil {
+		t.Fatalf("CreateExtraction: %v", err)
+	}
+	// JSONB normalisiert die Textform (z. B. Leerzeichen nach ':'), der Inhalt
+	// muss aber semantisch identisch bleiben — kein Byte-Vergleich.
+	var gotPayload, wantPayload map[string]any
+	if err := json.Unmarshal(ext.Payload, &gotPayload); err != nil {
+		t.Fatalf("unmarshal stored payload: %v", err)
+	}
+	if err := json.Unmarshal(payload, &wantPayload); err != nil {
+		t.Fatalf("unmarshal input payload: %v", err)
+	}
+	if gotPayload["gegenleistung"] != wantPayload["gegenleistung"] {
+		t.Fatalf("stored payload = %v, want %v", gotPayload, wantPayload)
+	}
+
+	got, err := s.GetLatestExtraction(ctx, sub.ID)
+	if err != nil {
+		t.Fatalf("GetLatestExtraction: %v", err)
+	}
+	if got.ID != ext.ID {
+		t.Fatalf("GetLatestExtraction returned a different row than CreateExtraction")
+	}
+
+	// Eine zweite Extraktion (erneute Pruefung) muss die "latest" sein.
+	payload2 := []byte(`{"gegenleistung":"keine"}`)
+	ext2, err := s.CreateExtraction(ctx, sub.ID, payload2, "claude-sonnet-5", "v1")
+	if err != nil {
+		t.Fatalf("CreateExtraction (2): %v", err)
+	}
+	got, err = s.GetLatestExtraction(ctx, sub.ID)
+	if err != nil {
+		t.Fatalf("GetLatestExtraction (2): %v", err)
+	}
+	if got.ID != ext2.ID {
+		t.Fatalf("GetLatestExtraction did not return the most recent extraction")
+	}
+}
+
+func TestFindingCRUDAndSupersedes(t *testing.T) {
+	s := openTestStore(t)
+	ctx := context.Background()
+
+	sub, err := s.CreateSubmission(ctx, "instagram", "reel", "...")
+	if err != nil {
+		t.Fatalf("CreateSubmission: %v", err)
+	}
+
+	old, err := s.CreateFinding(ctx, sub.ID, nil, "WK-004", 1, "hoch", "alte Fassung")
+	if err != nil {
+		t.Fatalf("CreateFinding (old): %v", err)
+	}
+
+	current, err := s.ListCurrentFindings(ctx, sub.ID)
+	if err != nil {
+		t.Fatalf("ListCurrentFindings: %v", err)
+	}
+	if len(current) != 1 || current[0].ID != old.ID {
+		t.Fatalf("expected exactly the old finding before any correction, got %+v", current)
+	}
+
+	// Korrektur: neue Zeile, die die alte per supersedes ersetzt.
+	_, err = s.Pool.Exec(ctx, `
+		INSERT INTO finding (submission_id, rule_id, rule_version, severity, message, supersedes)
+		VALUES ($1, 'WK-004', 2, 'hoch', 'korrigierte Fassung', $2)
+	`, sub.ID, old.ID)
+	if err != nil {
+		t.Fatalf("insert superseding finding: %v", err)
+	}
+
+	current, err = s.ListCurrentFindings(ctx, sub.ID)
+	if err != nil {
+		t.Fatalf("ListCurrentFindings nach Korrektur: %v", err)
+	}
+	if len(current) != 1 {
+		t.Fatalf("expected exactly one current finding after a correction, got %d: %+v", len(current), current)
+	}
+	if current[0].Message != "korrigierte Fassung" {
+		t.Fatalf("expected the corrected finding to be current, got %+v", current[0])
+	}
+}
+
+func TestEvidencePackageCRUD(t *testing.T) {
+	s := openTestStore(t)
+	ctx := context.Background()
+
+	sub, err := s.CreateSubmission(ctx, "instagram", "reel", "...")
+	if err != nil {
+		t.Fatalf("CreateSubmission: %v", err)
+	}
+
+	token := []byte("fake-rfc3161-token-bytes")
+	pkg, err := s.CreateEvidencePackage(ctx, sub.ID, "/var/lib/deklarix/dossiers/x.pdf", "deadbeef", token)
+	if err != nil {
+		t.Fatalf("CreateEvidencePackage: %v", err)
+	}
+
+	got, err := s.GetLatestEvidencePackage(ctx, sub.ID)
+	if err != nil {
+		t.Fatalf("GetLatestEvidencePackage: %v", err)
+	}
+	if got.ID != pkg.ID || string(got.TimestampToken) != string(token) {
+		t.Fatalf("GetLatestEvidencePackage = %+v, unerwartete Werte", got)
+	}
+
+	// Append-only: ein UPDATE muss vom Trigger abgelehnt werden.
+	_, err = s.Pool.Exec(ctx, `UPDATE evidence_package SET sha256 = 'geaendert' WHERE id = $1`, pkg.ID)
+	if err == nil {
+		t.Fatal("expected UPDATE on evidence_package to be rejected, but it succeeded")
+	}
+}
diff --git a/internal/store/evidence.go b/internal/store/evidence.go
new file mode 100644
index 0000000..5c6fa78
--- /dev/null
+++ b/internal/store/evidence.go
@@ -0,0 +1,54 @@
+package store
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+// EvidencePackage ist das Ergebnis der Archivierung eines Beitrags:
+// Dossier-Pfad, Hash der kanonisierten Metadaten und RFC-3161-Token.
+// Append-only: siehe Migration.
+type EvidencePackage struct {
+	ID             string
+	SubmissionID   string
+	DossierPath    string
+	SHA256         string
+	TimestampToken []byte
+	CreatedAt      time.Time
+}
+
+// CreateEvidencePackage speichert ein EvidencePackage.
+func (s *Store) CreateEvidencePackage(ctx context.Context, submissionID, dossierPath, sha256Hex string, timestampToken []byte) (EvidencePackage, error) {
+	var e EvidencePackage
+	err := s.Pool.QueryRow(ctx, `
+		INSERT INTO evidence_package (submission_id, dossier_path, sha256, timestamp_token)
+		VALUES ($1, $2, $3, $4)
+		RETURNING id, submission_id, dossier_path, sha256, timestamp_token, created_at
+	`, submissionID, dossierPath, sha256Hex, timestampToken).Scan(
+		&e.ID, &e.SubmissionID, &e.DossierPath, &e.SHA256, &e.TimestampToken, &e.CreatedAt,
+	)
+	if err != nil {
+		return EvidencePackage{}, fmt.Errorf("store: create evidence package: %w", err)
+	}
+	return e, nil
+}
+
+// GetLatestEvidencePackage liefert das zuletzt erzeugte EvidencePackage
+// für einen Beitrag.
+func (s *Store) GetLatestEvidencePackage(ctx context.Context, submissionID string) (EvidencePackage, error) {
+	var e EvidencePackage
+	err := s.Pool.QueryRow(ctx, `
+		SELECT id, submission_id, dossier_path, sha256, timestamp_token, created_at
+		FROM evidence_package
+		WHERE submission_id = $1
+		ORDER BY created_at DESC
+		LIMIT 1
+	`, submissionID).Scan(
+		&e.ID, &e.SubmissionID, &e.DossierPath, &e.SHA256, &e.TimestampToken, &e.CreatedAt,
+	)
+	if err != nil {
+		return EvidencePackage{}, fmt.Errorf("store: get latest evidence package: %w", err)
+	}
+	return e, nil
+}
diff --git a/internal/store/extraction.go b/internal/store/extraction.go
new file mode 100644
index 0000000..1f539e9
--- /dev/null
+++ b/internal/store/extraction.go
@@ -0,0 +1,56 @@
+package store
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+// Extraction ist das Ergebnis der Stufe-1-Extraktion für einen Beitrag.
+// Payload ist das rohe, vom Modell gelieferte JSON — nicht eine
+// abgeleitete Repräsentation. Append-only: siehe Migration.
+type Extraction struct {
+	ID            string
+	SubmissionID  string
+	Payload       []byte
+	ModelVersion  string
+	PromptVersion string
+	CreatedAt     time.Time
+}
+
+// CreateExtraction speichert eine Extraktion. payload ist das rohe
+// JSON, wie es das Modell zurückgegeben hat (siehe extract.Result.RawJSON).
+func (s *Store) CreateExtraction(ctx context.Context, submissionID string, payload []byte, modelVersion, promptVersion string) (Extraction, error) {
+	var e Extraction
+	err := s.Pool.QueryRow(ctx, `
+		INSERT INTO extraction (submission_id, payload, model_version, prompt_version)
+		VALUES ($1, $2, $3, $4)
+		RETURNING id, submission_id, payload, model_version, prompt_version, created_at
+	`, submissionID, payload, modelVersion, promptVersion).Scan(
+		&e.ID, &e.SubmissionID, &e.Payload, &e.ModelVersion, &e.PromptVersion, &e.CreatedAt,
+	)
+	if err != nil {
+		return Extraction{}, fmt.Errorf("store: create extraction: %w", err)
+	}
+	return e, nil
+}
+
+// GetLatestExtraction liest die zuletzt erzeugte Extraktion für einen
+// Beitrag (append-only: es kann mehrere geben, z. B. bei einer erneuten
+// Prüfung — die aktuellste zählt).
+func (s *Store) GetLatestExtraction(ctx context.Context, submissionID string) (Extraction, error) {
+	var e Extraction
+	err := s.Pool.QueryRow(ctx, `
+		SELECT id, submission_id, payload, model_version, prompt_version, created_at
+		FROM extraction
+		WHERE submission_id = $1
+		ORDER BY created_at DESC
+		LIMIT 1
+	`, submissionID).Scan(
+		&e.ID, &e.SubmissionID, &e.Payload, &e.ModelVersion, &e.PromptVersion, &e.CreatedAt,
+	)
+	if err != nil {
+		return Extraction{}, fmt.Errorf("store: get latest extraction: %w", err)
+	}
+	return e, nil
+}
diff --git a/internal/store/finding.go b/internal/store/finding.go
new file mode 100644
index 0000000..2e0cbc7
--- /dev/null
+++ b/internal/store/finding.go
@@ -0,0 +1,67 @@
+package store
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+// Finding ist das Ergebnis einer Regel für einen Beitrag. Append-only:
+// siehe Migration. ExtractionID ist optional (nil wenn ein Finding nicht
+// direkt aus einer Extraktion, sondern z. B. manuell erzeugt wurde).
+type Finding struct {
+	ID           string
+	SubmissionID string
+	ExtractionID *string
+	RuleID       string
+	RuleVersion  int
+	Severity     string
+	Message      string
+	CreatedAt    time.Time
+}
+
+// CreateFinding speichert ein Finding.
+func (s *Store) CreateFinding(ctx context.Context, submissionID string, extractionID *string, ruleID string, ruleVersion int, severity, message string) (Finding, error) {
+	var f Finding
+	err := s.Pool.QueryRow(ctx, `
+		INSERT INTO finding (submission_id, extraction_id, rule_id, rule_version, severity, message)
+		VALUES ($1, $2, $3, $4, $5, $6)
+		RETURNING id, submission_id, extraction_id, rule_id, rule_version, severity, message, created_at
+	`, submissionID, extractionID, ruleID, ruleVersion, severity, message).Scan(
+		&f.ID, &f.SubmissionID, &f.ExtractionID, &f.RuleID, &f.RuleVersion, &f.Severity, &f.Message, &f.CreatedAt,
+	)
+	if err != nil {
+		return Finding{}, fmt.Errorf("store: create finding: %w", err)
+	}
+	return f, nil
+}
+
+// ListCurrentFindings liefert die aktuell gültigen Findings eines
+// Beitrags — Zeilen, die von keiner anderen Zeile per supersedes
+// ersetzt wurden (siehe Migrationskommentar zu finding.supersedes).
+func (s *Store) ListCurrentFindings(ctx context.Context, submissionID string) ([]Finding, error) {
+	rows, err := s.Pool.Query(ctx, `
+		SELECT f.id, f.submission_id, f.extraction_id, f.rule_id, f.rule_version, f.severity, f.message, f.created_at
+		FROM finding f
+		WHERE f.submission_id = $1
+		  AND NOT EXISTS (SELECT 1 FROM finding f2 WHERE f2.supersedes = f.id)
+		ORDER BY f.created_at
+	`, submissionID)
+	if err != nil {
+		return nil, fmt.Errorf("store: list current findings: %w", err)
+	}
+	defer rows.Close()
+
+	var findings []Finding
+	for rows.Next() {
+		var f Finding
+		if err := rows.Scan(&f.ID, &f.SubmissionID, &f.ExtractionID, &f.RuleID, &f.RuleVersion, &f.Severity, &f.Message, &f.CreatedAt); err != nil {
+			return nil, fmt.Errorf("store: scan finding: %w", err)
+		}
+		findings = append(findings, f)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("store: list current findings: %w", err)
+	}
+	return findings, nil
+}
diff --git a/internal/store/submission.go b/internal/store/submission.go
new file mode 100644
index 0000000..296e300
--- /dev/null
+++ b/internal/store/submission.go
@@ -0,0 +1,66 @@
+package store
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+// Submission ist ein eingereichter Beitrag.
+type Submission struct {
+	ID        string
+	Platform  string
+	PostType  string
+	Caption   string
+	Status    string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+// CreateSubmission legt einen neuen Beitrag an (Status "draft").
+func (s *Store) CreateSubmission(ctx context.Context, platform, postType, caption string) (Submission, error) {
+	var sub Submission
+	err := s.Pool.QueryRow(ctx, `
+		INSERT INTO submission (platform, post_type, caption)
+		VALUES ($1, $2, $3)
+		RETURNING id, platform, post_type, caption, status, created_at, updated_at
+	`, platform, postType, caption).Scan(
+		&sub.ID, &sub.Platform, &sub.PostType, &sub.Caption, &sub.Status, &sub.CreatedAt, &sub.UpdatedAt,
+	)
+	if err != nil {
+		return Submission{}, fmt.Errorf("store: create submission: %w", err)
+	}
+	return sub, nil
+}
+
+// GetSubmission liest einen Beitrag anhand seiner ID.
+func (s *Store) GetSubmission(ctx context.Context, id string) (Submission, error) {
+	var sub Submission
+	err := s.Pool.QueryRow(ctx, `
+		SELECT id, platform, post_type, caption, status, created_at, updated_at
+		FROM submission WHERE id = $1
+	`, id).Scan(
+		&sub.ID, &sub.Platform, &sub.PostType, &sub.Caption, &sub.Status, &sub.CreatedAt, &sub.UpdatedAt,
+	)
+	if err != nil {
+		return Submission{}, fmt.Errorf("store: get submission: %w", err)
+	}
+	return sub, nil
+}
+
+// SetSubmissionStatus setzt den Status eines Beitrags (submission ist,
+// anders als extraction/finding/evidence_package, NICHT append-only —
+// der Lebenszyklus draft → checked → published → archived ist eine
+// normale Zustandsänderung, kein Beweis-Eintrag).
+func (s *Store) SetSubmissionStatus(ctx context.Context, id, status string) error {
+	tag, err := s.Pool.Exec(ctx, `
+		UPDATE submission SET status = $2, updated_at = now() WHERE id = $1
+	`, id, status)
+	if err != nil {
+		return fmt.Errorf("store: set submission status: %w", err)
+	}
+	if tag.RowsAffected() == 0 {
+		return fmt.Errorf("store: set submission status: submission %s nicht gefunden", id)
+	}
+	return nil
+}