diff --git a/apps/backend/internal/agent/settings/store/postgres_schema_test.go b/apps/backend/internal/agent/settings/store/postgres_schema_test.go
new file mode 100644
index 0000000000..800dd4c626
--- /dev/null
+++ b/apps/backend/internal/agent/settings/store/postgres_schema_test.go
@@ -0,0 +1,15 @@
+package store
+
+import (
+	"testing"
+
+	"github.com/kandev/kandev/internal/testutil"
+)
+
+func TestPostgresFreshSchemaInitializes(t *testing.T) {
+	db := testutil.OpenIsolatedPostgres(t, testutil.PostgresDSNFromEnv(t))
+
+	if _, err := newSQLiteRepositoryWithDB(db, db, nil); err != nil {
+		t.Fatalf("init fresh postgres schema: %v", err)
+	}
+}
diff --git a/apps/backend/internal/agent/settings/store/sqlite.go b/apps/backend/internal/agent/settings/store/sqlite.go
index 6c982f13fa..69eb176389 100644
--- a/apps/backend/internal/agent/settings/store/sqlite.go
+++ b/apps/backend/internal/agent/settings/store/sqlite.go
@@ -204,6 +204,10 @@ func (r *sqliteRepository) migrateOfficeEnrichmentColumns() {
 // The migration is idempotent: it inspects sqlite_master for the CHECK keyword
 // and only proceeds when the constraint is present.
 func (r *sqliteRepository) migrateDropModelCheckConstraint() error {
+	if dialect.IsPostgres(r.db.DriverName()) {
+		return nil
+	}
+
 	var tableDDL string
 	err := r.db.QueryRow(
 		`SELECT sql FROM sqlite_master WHERE type='table' AND name='agent_profiles'`,
diff --git a/apps/backend/internal/db/dialect/dialect_test.go b/apps/backend/internal/db/dialect/dialect_test.go
index 081bd4a483..f34e2315c5 100644
--- a/apps/backend/internal/db/dialect/dialect_test.go
+++ b/apps/backend/internal/db/dialect/dialect_test.go
@@ -27,6 +27,15 @@ func TestBoolToInt(t *testing.T) {
 	}
 }
 
+func TestBlobType(t *testing.T) {
+	if BlobType(SQLite3) != "BLOB" {
+		t.Errorf("sqlite: got %q", BlobType(SQLite3))
+	}
+	if BlobType(PGX) != "BYTEA" {
+		t.Errorf("pgx: got %q", BlobType(PGX))
+	}
+}
+
 func TestJSONExtract(t *testing.T) {
 	got := JSONExtract(SQLite3, "metadata", "status")
 	if got != "json_extract(metadata, '$.status')" {
diff --git a/apps/backend/internal/db/dialect/types.go b/apps/backend/internal/db/dialect/types.go
new file mode 100644
index 0000000000..b78c88c79c
--- /dev/null
+++ b/apps/backend/internal/db/dialect/types.go
@@ -0,0 +1,9 @@
+package dialect
+
+// BlobType returns the portable binary column type for the active driver.
+func BlobType(driver string) string {
+	if IsPostgres(driver) {
+		return "BYTEA"
+	}
+	return "BLOB"
+}
diff --git a/apps/backend/internal/office/repository/sqlite/base.go b/apps/backend/internal/office/repository/sqlite/base.go
index eb49d3ebd5..a62e79c6be 100644
--- a/apps/backend/internal/office/repository/sqlite/base.go
+++ b/apps/backend/internal/office/repository/sqlite/base.go
@@ -206,8 +206,8 @@ func (r *Repository) createAgentTables() error {
 		is_system INTEGER NOT NULL DEFAULT 0,
 		system_version TEXT NOT NULL DEFAULT '',
 		default_for_roles TEXT NOT NULL DEFAULT '[]',
-		created_at DATETIME NOT NULL,
-		updated_at DATETIME NOT NULL,
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL,
 		UNIQUE(workspace_id, slug)
 	);
 	`)
@@ -227,8 +227,8 @@ func (r *Repository) createProjectTables() error {
 		budget_cents INTEGER DEFAULT 0,
 		repositories TEXT DEFAULT '[]',
 		executor_config TEXT DEFAULT '{}',
-		created_at DATETIME NOT NULL,
-		updated_at DATETIME NOT NULL
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL
 	);
 	`)
 	return err
@@ -240,8 +240,8 @@ func (r *Repository) createAgentRuntimeTable() error {
 		agent_id TEXT PRIMARY KEY,
 		status TEXT NOT NULL DEFAULT 'idle',
 		pause_reason TEXT DEFAULT '',
-		last_run_finished_at DATETIME,
-		updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
+		last_run_finished_at TIMESTAMP,
+		updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 	);
 	`)
 	return err
@@ -266,8 +266,8 @@ func (r *Repository) createCostTables() error {
 		tokens_out INTEGER DEFAULT 0,
 		cost_subcents INTEGER NOT NULL DEFAULT 0,
 		estimated INTEGER NOT NULL DEFAULT 0,
-		occurred_at DATETIME NOT NULL,
-		created_at DATETIME NOT NULL
+		occurred_at TIMESTAMP NOT NULL,
+		created_at TIMESTAMP NOT NULL
 	);
 
 	CREATE INDEX IF NOT EXISTS idx_office_cost_agent ON office_cost_events(agent_profile_id);
@@ -283,8 +283,8 @@ func (r *Repository) createCostTables() error {
 		period TEXT NOT NULL,
 		alert_threshold_pct INTEGER DEFAULT 80,
 		action_on_exceed TEXT DEFAULT 'notify_only',
-		created_at DATETIME NOT NULL,
-		updated_at DATETIME NOT NULL
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL
 	);
 	`)
 	return err
@@ -307,7 +307,7 @@ func (r *Repository) createRunTables() error {
 		failure_reason TEXT NOT NULL DEFAULT '',
 		session_id TEXT NOT NULL DEFAULT '',
 		retry_count INTEGER DEFAULT 0,
-		scheduled_retry_at DATETIME,
+		scheduled_retry_at TIMESTAMP,
 		error_message TEXT NOT NULL DEFAULT '',
 		cancel_reason TEXT,
 		-- Provider routing (office-provider-routing).
@@ -330,9 +330,9 @@ func (r *Repository) createRunTables() error {
 		result_json TEXT NOT NULL DEFAULT '{}',
 		assembled_prompt TEXT NOT NULL DEFAULT '',
 		summary_injected TEXT NOT NULL DEFAULT '',
-		requested_at DATETIME NOT NULL,
-		claimed_at DATETIME,
-		finished_at DATETIME
+		requested_at TIMESTAMP NOT NULL,
+		claimed_at TIMESTAMP,
+		finished_at TIMESTAMP
 	);
 	CREATE INDEX IF NOT EXISTS idx_run_status_requested ON runs(status, requested_at);
 	CREATE UNIQUE INDEX IF NOT EXISTS idx_run_idempotency ON runs(idempotency_key) WHERE idempotency_key IS NOT NULL;
@@ -363,9 +363,9 @@ func (r *Repository) createRoutineTables() error {
 		catch_up_policy TEXT NOT NULL DEFAULT 'enqueue_missed_with_cap',
 		catch_up_max INTEGER NOT NULL DEFAULT 25,
 		variables TEXT DEFAULT '{}',
-		last_run_at DATETIME,
-		created_at DATETIME NOT NULL,
-		updated_at DATETIME NOT NULL
+		last_run_at TIMESTAMP,
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL
 	);
 
 	CREATE TABLE IF NOT EXISTS office_routine_triggers (
@@ -377,11 +377,11 @@ func (r *Repository) createRoutineTables() error {
 		public_id TEXT DEFAULT '',
 		signing_mode TEXT DEFAULT '',
 		secret TEXT DEFAULT '',
-		next_run_at DATETIME,
-		last_fired_at DATETIME,
+		next_run_at TIMESTAMP,
+		last_fired_at TIMESTAMP,
 		enabled INTEGER DEFAULT 1,
-		created_at DATETIME NOT NULL,
-		updated_at DATETIME NOT NULL,
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL,
 		FOREIGN KEY (routine_id) REFERENCES office_routines(id) ON DELETE CASCADE
 	);
 
@@ -395,9 +395,9 @@ func (r *Repository) createRoutineTables() error {
 		linked_task_id TEXT DEFAULT '',
 		coalesced_into_run_id TEXT DEFAULT '',
 		dispatch_fingerprint TEXT DEFAULT '',
-		started_at DATETIME,
-		completed_at DATETIME,
-		created_at DATETIME NOT NULL,
+		started_at TIMESTAMP,
+		completed_at TIMESTAMP,
+		created_at TIMESTAMP NOT NULL,
 		FOREIGN KEY (routine_id) REFERENCES office_routines(id) ON DELETE CASCADE
 	);
 	`)
@@ -415,9 +415,9 @@ func (r *Repository) createApprovalTables() error {
 		payload TEXT DEFAULT '{}',
 		decision_note TEXT DEFAULT '',
 		decided_by TEXT DEFAULT '',
-		decided_at DATETIME,
-		created_at DATETIME NOT NULL,
-		updated_at DATETIME NOT NULL
+		decided_at TIMESTAMP,
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL
 	);
 	`)
 	return err
@@ -436,7 +436,7 @@ func (r *Repository) createActivityTables() error {
 		details TEXT DEFAULT '{}',
 		run_id TEXT NOT NULL DEFAULT '',
 		session_id TEXT NOT NULL DEFAULT '',
-		created_at DATETIME NOT NULL
+		created_at TIMESTAMP NOT NULL
 	);
 	CREATE INDEX IF NOT EXISTS idx_activity_workspace_created ON office_activity_log(workspace_id, created_at DESC);
 	CREATE INDEX IF NOT EXISTS idx_activity_run_id ON office_activity_log(run_id) WHERE run_id != '';
@@ -448,7 +448,7 @@ func (r *Repository) createActivityTables() error {
 		event_type TEXT NOT NULL,
 		level TEXT NOT NULL DEFAULT 'info',
 		payload TEXT NOT NULL DEFAULT '{}',
-		created_at DATETIME NOT NULL,
+		created_at TIMESTAMP NOT NULL,
 		PRIMARY KEY (run_id, seq)
 	);
 	CREATE INDEX IF NOT EXISTS idx_run_events_run_created ON run_events(run_id, created_at);
@@ -465,8 +465,8 @@ func (r *Repository) createMemoryTables() error {
 		key TEXT NOT NULL,
 		content TEXT DEFAULT '',
 		metadata TEXT DEFAULT '{}',
-		created_at DATETIME NOT NULL,
-		updated_at DATETIME NOT NULL,
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL,
 		UNIQUE(agent_profile_id, layer, key)
 	);
 	`)
@@ -484,8 +484,8 @@ func (r *Repository) createChannelTables() error {
 		webhook_secret TEXT NOT NULL DEFAULT '',
 		status TEXT DEFAULT 'active',
 		task_id TEXT DEFAULT '',
-		created_at DATETIME NOT NULL,
-		updated_at DATETIME NOT NULL
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL
 	);
 	`)
 	return err
@@ -498,8 +498,8 @@ func (r *Repository) createOnboardingTable() error {
 		completed INTEGER NOT NULL DEFAULT 0,
 		ceo_agent_id TEXT DEFAULT '',
 		first_task_id TEXT DEFAULT '',
-		completed_at DATETIME,
-		created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+		completed_at TIMESTAMP,
+		created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 	);
 	`)
 	return err
@@ -513,8 +513,8 @@ func (r *Repository) createInstructionTable() error {
 		filename TEXT NOT NULL,
 		content TEXT NOT NULL DEFAULT '',
 		is_entry INTEGER DEFAULT 0,
-		created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-		updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+		created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+		updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
 		UNIQUE(agent_profile_id, filename)
 	);
 	`)
@@ -528,8 +528,8 @@ func (r *Repository) createLabelTables() error {
 		workspace_id TEXT NOT NULL,
 		name TEXT NOT NULL,
 		color TEXT NOT NULL DEFAULT '#6b7280',
-		created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
-		updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+		created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+		updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
 		UNIQUE(workspace_id, name)
 	);
 	CREATE INDEX IF NOT EXISTS idx_office_labels_workspace ON office_labels(workspace_id);
@@ -537,7 +537,7 @@ func (r *Repository) createLabelTables() error {
 	CREATE TABLE IF NOT EXISTS office_task_labels (
 		task_id TEXT NOT NULL,
 		label_id TEXT NOT NULL,
-		created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+		created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
 		PRIMARY KEY (task_id, label_id),
 		FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE,
 		FOREIGN KEY (label_id) REFERENCES office_labels(id) ON DELETE CASCADE
@@ -552,7 +552,7 @@ func (r *Repository) createTaskExtensionTables() error {
 	CREATE TABLE IF NOT EXISTS task_blockers (
 		task_id TEXT NOT NULL,
 		blocker_task_id TEXT NOT NULL,
-		created_at DATETIME NOT NULL,
+		created_at TIMESTAMP NOT NULL,
 		PRIMARY KEY (task_id, blocker_task_id),
 		CHECK (task_id != blocker_task_id)
 	);
@@ -565,7 +565,7 @@ func (r *Repository) createTaskExtensionTables() error {
 		body TEXT NOT NULL,
 		source TEXT NOT NULL DEFAULT 'user',
 		reply_channel_id TEXT DEFAULT '',
-		created_at DATETIME NOT NULL
+		created_at TIMESTAMP NOT NULL
 	);
 	CREATE INDEX IF NOT EXISTS idx_task_comments_task_created ON task_comments(task_id, created_at);
 
diff --git a/apps/backend/internal/office/repository/sqlite/base_migrations.go b/apps/backend/internal/office/repository/sqlite/base_migrations.go
index d1ad4ffa72..157f631847 100644
--- a/apps/backend/internal/office/repository/sqlite/base_migrations.go
+++ b/apps/backend/internal/office/repository/sqlite/base_migrations.go
@@ -104,7 +104,7 @@ func (r *Repository) migrateFailureColumns() {
 	CREATE TABLE IF NOT EXISTS office_workspace_settings (
 		workspace_id TEXT PRIMARY KEY,
 		agent_failure_threshold INTEGER NOT NULL DEFAULT 3,
-		updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+		updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
 	)`)
 
 	_, _ = r.db.Exec(`
@@ -112,7 +112,7 @@ func (r *Repository) migrateFailureColumns() {
 		user_id TEXT NOT NULL,
 		item_kind TEXT NOT NULL,
 		item_id TEXT NOT NULL,
-		dismissed_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+		dismissed_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
 		PRIMARY KEY (user_id, item_kind, item_id)
 	)`)
 	_, _ = r.db.Exec(`CREATE INDEX IF NOT EXISTS idx_office_inbox_dismissals_kind ON office_inbox_dismissals(item_kind, item_id)`)
@@ -126,7 +126,7 @@ func (r *Repository) migrateFailureColumns() {
 // directly without an interim ALTER step.
 func (r *Repository) migrateSchedulerColumns() {
 	r.migrate.Apply("tasks.checkout_agent_id", `ALTER TABLE tasks ADD COLUMN checkout_agent_id TEXT`)
-	r.migrate.Apply("tasks.checkout_at", `ALTER TABLE tasks ADD COLUMN checkout_at DATETIME`)
+	r.migrate.Apply("tasks.checkout_at", `ALTER TABLE tasks ADD COLUMN checkout_at TIMESTAMP`)
 }
 
 // migrateTaskFTS creates the FTS5 virtual table and triggers for full-text task search.
@@ -354,7 +354,7 @@ func taskPriorityMigrationStatements() []string {
 			labels TEXT DEFAULT '[]',
 			identifier TEXT,
 			checkout_agent_id TEXT,
-			checkout_at DATETIME
+			checkout_at TIMESTAMP
 		)`,
 		// archived_by_cascade_id is added to the task schema by
 		// task/repository/sqlite/base.go runMigrations() via an
diff --git a/apps/backend/internal/office/repository/sqlite/failure.go b/apps/backend/internal/office/repository/sqlite/failure.go
index 2f154482b8..d27fd7d8e1 100644
--- a/apps/backend/internal/office/repository/sqlite/failure.go
+++ b/apps/backend/internal/office/repository/sqlite/failure.go
@@ -262,7 +262,7 @@ func (r *Repository) ListFailedRunsForInbox(
 }
 
 // parseSqliteTime parses the various string formats SQLite stores
-// DATETIME values in (RFC3339, with or without timezone, with or
+// TIMESTAMP values in (RFC3339, with or without timezone, with or
 // without nanoseconds). Falls back to zero time on parse failure
 // rather than erroring, since the inbox doesn't break if a row's
 // timestamp is unparseable.
diff --git a/apps/backend/internal/office/repository/sqlite/tree_holds.go b/apps/backend/internal/office/repository/sqlite/tree_holds.go
index 80e60b2cec..7e371ce535 100644
--- a/apps/backend/internal/office/repository/sqlite/tree_holds.go
+++ b/apps/backend/internal/office/repository/sqlite/tree_holds.go
@@ -20,10 +20,10 @@ func (r *Repository) createTreeHoldTables() error {
 		root_task_id TEXT NOT NULL,
 		mode TEXT NOT NULL,
 		release_policy TEXT NOT NULL DEFAULT '{"strategy":"manual"}',
-		released_at DATETIME,
+		released_at TIMESTAMP,
 		released_by TEXT DEFAULT '',
 		released_reason TEXT DEFAULT '',
-		created_at DATETIME NOT NULL,
+		created_at TIMESTAMP NOT NULL,
 		FOREIGN KEY (root_task_id) REFERENCES tasks(id) ON DELETE CASCADE
 	);
 
diff --git a/apps/backend/internal/office/repository/sqlite/workspace_groups.go b/apps/backend/internal/office/repository/sqlite/workspace_groups.go
index 6fb2ed1850..2ed4922736 100644
--- a/apps/backend/internal/office/repository/sqlite/workspace_groups.go
+++ b/apps/backend/internal/office/repository/sqlite/workspace_groups.go
@@ -31,13 +31,13 @@ func (r *Repository) createWorkspaceGroupTables() error {
 		owned_by_kandev INTEGER NOT NULL DEFAULT 0,
 		cleanup_policy TEXT NOT NULL DEFAULT 'never_delete',
 		cleanup_status TEXT NOT NULL DEFAULT 'active',
-		cleaned_at DATETIME,
+		cleaned_at TIMESTAMP,
 		cleanup_error TEXT NOT NULL DEFAULT '',
 		restore_status TEXT NOT NULL DEFAULT 'not_needed',
 		restore_error TEXT NOT NULL DEFAULT '',
 		restore_config_json TEXT NOT NULL DEFAULT '',
-		created_at DATETIME NOT NULL,
-		updated_at DATETIME NOT NULL
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL
 	);
 
 	CREATE INDEX IF NOT EXISTS idx_task_workspace_groups_workspace
@@ -49,10 +49,10 @@ func (r *Repository) createWorkspaceGroupTables() error {
 		workspace_group_id TEXT NOT NULL,
 		task_id TEXT NOT NULL,
 		role TEXT NOT NULL DEFAULT 'member',
-		released_at DATETIME,
+		released_at TIMESTAMP,
 		release_reason TEXT NOT NULL DEFAULT '',
 		released_by_cascade_id TEXT NOT NULL DEFAULT '',
-		created_at DATETIME NOT NULL,
+		created_at TIMESTAMP NOT NULL,
 		PRIMARY KEY (workspace_group_id, task_id),
 		FOREIGN KEY (workspace_group_id) REFERENCES task_workspace_groups(id) ON DELETE CASCADE
 	);
diff --git a/apps/backend/internal/persistence/meta.go b/apps/backend/internal/persistence/meta.go
index bf482f6686..5089d63611 100644
--- a/apps/backend/internal/persistence/meta.go
+++ b/apps/backend/internal/persistence/meta.go
@@ -33,7 +33,7 @@ func ensureMetaTable(db *sqlx.DB) error {
 // readKey returns the value for key, or "" when the key is absent.
 func readKey(db *sqlx.DB, key string) (string, error) {
 	var value string
-	err := db.QueryRow(`SELECT value FROM kandev_meta WHERE key = ?`, key).Scan(&value)
+	err := db.QueryRow(db.Rebind(`SELECT value FROM kandev_meta WHERE key = ?`), key).Scan(&value)
 	if errors.Is(err, sql.ErrNoRows) {
 		return "", nil
 	}
@@ -46,8 +46,8 @@ func readKey(db *sqlx.DB, key string) (string, error) {
 // writeKey upserts key=value into kandev_meta.
 func writeKey(db *sqlx.DB, key, value string) error {
 	_, err := db.Exec(
-		`INSERT INTO kandev_meta (key, value) VALUES (?, ?)
-		 ON CONFLICT(key) DO UPDATE SET value = excluded.value`,
+		db.Rebind(`INSERT INTO kandev_meta (key, value) VALUES (?, ?)
+		 ON CONFLICT(key) DO UPDATE SET value = excluded.value`),
 		key, value,
 	)
 	if err != nil {
diff --git a/apps/backend/internal/persistence/postgres_meta_test.go b/apps/backend/internal/persistence/postgres_meta_test.go
new file mode 100644
index 0000000000..926dfe4d17
--- /dev/null
+++ b/apps/backend/internal/persistence/postgres_meta_test.go
@@ -0,0 +1,28 @@
+package persistence
+
+import (
+	"testing"
+	"time"
+
+	"github.com/kandev/kandev/internal/testutil"
+)
+
+func TestPostgresLatestVersionMetaRoundTrip(t *testing.T) {
+	db := testutil.OpenIsolatedPostgres(t, testutil.PostgresDSNFromEnv(t))
+
+	if err := ensureMetaTable(db); err != nil {
+		t.Fatalf("ensure meta table: %v", err)
+	}
+
+	checkedAt := time.Unix(123, 0).UTC()
+	if err := WriteLatestVersion(db, "v1.2.3", "https://example.test/release", checkedAt); err != nil {
+		t.Fatalf("write latest version: %v", err)
+	}
+	version, url, gotCheckedAt, err := ReadLatestVersion(db)
+	if err != nil {
+		t.Fatalf("read latest version: %v", err)
+	}
+	if version != "v1.2.3" || url != "https://example.test/release" || !gotCheckedAt.Equal(checkedAt) {
+		t.Fatalf("meta round-trip = (%q, %q, %s)", version, url, gotCheckedAt)
+	}
+}
diff --git a/apps/backend/internal/persistence/provider.go b/apps/backend/internal/persistence/provider.go
index 3aa702dd00..1c27a877ff 100644
--- a/apps/backend/internal/persistence/provider.go
+++ b/apps/backend/internal/persistence/provider.go
@@ -186,6 +186,10 @@ func providePostgres(cfg *config.Config, log *logger.Logger) (*db.Pool, func() e
 	pgDB := sqlx.NewDb(dbConn, "pgx")
 	// For Postgres, writer and reader share the same pool.
 	pool := db.NewPool(pgDB, pgDB)
+	if err := ensureMetaTable(pgDB); err != nil {
+		_ = pool.Close()
+		return nil, nil, fmt.Errorf("ensure meta table: %w", err)
+	}
 
 	if log != nil {
 		log.Info("pre-migration backup skipped: postgres driver (use pg_dump)")
diff --git a/apps/backend/internal/secrets/postgres_store_test.go b/apps/backend/internal/secrets/postgres_store_test.go
new file mode 100644
index 0000000000..cef2e85dda
--- /dev/null
+++ b/apps/backend/internal/secrets/postgres_store_test.go
@@ -0,0 +1,92 @@
+package secrets
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"github.com/kandev/kandev/internal/testutil"
+)
+
+func TestPostgresStoreRoundTrip(t *testing.T) {
+	db := testutil.OpenIsolatedPostgres(t, testutil.PostgresDSNFromEnv(t))
+
+	crypto, err := NewMasterKeyProvider(t.TempDir())
+	if err != nil {
+		t.Fatalf("master key: %v", err)
+	}
+	store, cleanup, err := Provide(db, db, crypto)
+	if err != nil {
+		t.Fatalf("provide store: %v", err)
+	}
+	t.Cleanup(func() {
+		_ = cleanup()
+	})
+
+	ctx := context.Background()
+	secret := &SecretWithValue{Secret: Secret{Name: "token"}, Value: "s3cr3t"}
+	if err := store.Create(ctx, secret); err != nil {
+		t.Fatalf("create secret: %v", err)
+	}
+	got, err := store.Reveal(ctx, secret.ID)
+	if err != nil {
+		t.Fatalf("reveal secret: %v", err)
+	}
+	if got != "s3cr3t" {
+		t.Fatalf("revealed value = %q, want %q", got, "s3cr3t")
+	}
+
+	metadata, err := store.Get(ctx, secret.ID)
+	if err != nil {
+		t.Fatalf("get secret: %v", err)
+	}
+	if metadata.Name != "token" {
+		t.Fatalf("secret name = %q, want %q", metadata.Name, "token")
+	}
+
+	nameOnly := "renamed-token"
+	if err := store.Update(ctx, secret.ID, &UpdateSecretRequest{Name: &nameOnly}); err != nil {
+		t.Fatalf("update secret name: %v", err)
+	}
+	metadata, err = store.Get(ctx, secret.ID)
+	if err != nil {
+		t.Fatalf("get renamed secret: %v", err)
+	}
+	if metadata.Name != nameOnly {
+		t.Fatalf("renamed secret name = %q, want %q", metadata.Name, nameOnly)
+	}
+	got, err = store.Reveal(ctx, secret.ID)
+	if err != nil {
+		t.Fatalf("reveal renamed secret: %v", err)
+	}
+	if got != "s3cr3t" {
+		t.Fatalf("renamed secret value = %q, want %q", got, "s3cr3t")
+	}
+
+	newValue := "n3w-s3cr3t"
+	valueName := "renamed-token-with-value"
+	if err := store.Update(ctx, secret.ID, &UpdateSecretRequest{Name: &valueName, Value: &newValue}); err != nil {
+		t.Fatalf("update secret value: %v", err)
+	}
+	metadata, err = store.Get(ctx, secret.ID)
+	if err != nil {
+		t.Fatalf("get updated secret: %v", err)
+	}
+	if metadata.Name != valueName {
+		t.Fatalf("updated secret name = %q, want %q", metadata.Name, valueName)
+	}
+	got, err = store.Reveal(ctx, secret.ID)
+	if err != nil {
+		t.Fatalf("reveal updated secret: %v", err)
+	}
+	if got != newValue {
+		t.Fatalf("updated secret value = %q, want %q", got, newValue)
+	}
+
+	if err := store.Delete(ctx, secret.ID); err != nil {
+		t.Fatalf("delete secret: %v", err)
+	}
+	if _, err := store.Get(ctx, secret.ID); err == nil || !strings.Contains(err.Error(), "secret not found") {
+		t.Fatalf("get deleted secret error = %v, want not found", err)
+	}
+}
diff --git a/apps/backend/internal/secrets/sqlite_store.go b/apps/backend/internal/secrets/sqlite_store.go
index 631a7fd7cd..82720edb11 100644
--- a/apps/backend/internal/secrets/sqlite_store.go
+++ b/apps/backend/internal/secrets/sqlite_store.go
@@ -8,6 +8,8 @@ import (
 
 	"github.com/google/uuid"
 	"github.com/jmoiron/sqlx"
+
+	"github.com/kandev/kandev/internal/db/dialect"
 )
 
 type sqliteStore struct {
@@ -29,16 +31,17 @@ func Provide(writer, reader *sqlx.DB, crypto *MasterKeyProvider) (*sqliteStore,
 }
 
 func (s *sqliteStore) initSchema() error {
-	schema := `
+	binaryType := dialect.BlobType(s.db.DriverName())
+	schema := fmt.Sprintf(`
 	CREATE TABLE IF NOT EXISTS secrets (
 		id              TEXT PRIMARY KEY,
 		name            TEXT NOT NULL,
-		encrypted_value BLOB NOT NULL,
-		nonce           BLOB NOT NULL,
+		encrypted_value %s NOT NULL,
+		nonce           %s NOT NULL,
 		created_at      TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
 		updated_at      TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
 	);
-	`
+	`, binaryType, binaryType)
 	_, err := s.db.Exec(schema)
 	return err
 }
@@ -63,9 +66,9 @@ func (s *sqliteStore) Create(ctx context.Context, secret *SecretWithValue) error
 		return fmt.Errorf("encrypt secret: %w", err)
 	}
 
-	_, err = s.db.ExecContext(ctx, `
+	_, err = s.db.ExecContext(ctx, s.db.Rebind(`
 		INSERT INTO secrets (id, name, encrypted_value, nonce, created_at, updated_at)
-		VALUES (?, ?, ?, ?, ?, ?)`,
+		VALUES (?, ?, ?, ?, ?, ?)`),
 		secret.ID, secret.Name, ciphertext, nonce, now, now,
 	)
 	if err != nil {
@@ -76,9 +79,9 @@ func (s *sqliteStore) Create(ctx context.Context, secret *SecretWithValue) error
 
 func (s *sqliteStore) Get(ctx context.Context, id string) (*Secret, error) {
 	var row secretRow
-	err := s.ro.GetContext(ctx, &row, `
+	err := s.ro.GetContext(ctx, &row, s.ro.Rebind(`
 		SELECT id, name, created_at, updated_at
-		FROM secrets WHERE id = ?`, id)
+		FROM secrets WHERE id = ?`), id)
 	if err != nil {
 		if err == sql.ErrNoRows {
 			return nil, fmt.Errorf("secret not found: %s", id)
@@ -90,8 +93,8 @@ func (s *sqliteStore) Get(ctx context.Context, id string) (*Secret, error) {
 
 func (s *sqliteStore) Reveal(ctx context.Context, id string) (string, error) {
 	var ciphertext, nonce []byte
-	err := s.ro.QueryRowContext(ctx, `
-		SELECT encrypted_value, nonce FROM secrets WHERE id = ?`, id).
+	err := s.ro.QueryRowContext(ctx, s.ro.Rebind(`
+		SELECT encrypted_value, nonce FROM secrets WHERE id = ?`), id).
 		Scan(&ciphertext, &nonce)
 	if err != nil {
 		if err == sql.ErrNoRows {
@@ -124,18 +127,18 @@ func (s *sqliteStore) Update(ctx context.Context, id string, req *UpdateSecretRe
 		if err != nil {
 			return fmt.Errorf("encrypt secret: %w", err)
 		}
-		_, err = s.db.ExecContext(ctx, `
+		_, err = s.db.ExecContext(ctx, s.db.Rebind(`
 			UPDATE secrets SET name = ?, encrypted_value = ?, nonce = ?, updated_at = ?
-			WHERE id = ?`,
+			WHERE id = ?`),
 			existing.Name, ciphertext, nonce, now, id,
 		)
 		if err != nil {
 			return fmt.Errorf("update secret: %w", err)
 		}
 	} else {
-		_, err = s.db.ExecContext(ctx, `
+		_, err = s.db.ExecContext(ctx, s.db.Rebind(`
 			UPDATE secrets SET name = ?, updated_at = ?
-			WHERE id = ?`,
+			WHERE id = ?`),
 			existing.Name, now, id,
 		)
 		if err != nil {
@@ -146,7 +149,7 @@ func (s *sqliteStore) Update(ctx context.Context, id string, req *UpdateSecretRe
 }
 
 func (s *sqliteStore) Delete(ctx context.Context, id string) error {
-	result, err := s.db.ExecContext(ctx, `DELETE FROM secrets WHERE id = ?`, id)
+	result, err := s.db.ExecContext(ctx, s.db.Rebind(`DELETE FROM secrets WHERE id = ?`), id)
 	if err != nil {
 		return fmt.Errorf("delete secret: %w", err)
 	}
diff --git a/apps/backend/internal/task/repository/sqlite/base_migrations.go b/apps/backend/internal/task/repository/sqlite/base_migrations.go
index ecc1dc4a65..520ba48d87 100644
--- a/apps/backend/internal/task/repository/sqlite/base_migrations.go
+++ b/apps/backend/internal/task/repository/sqlite/base_migrations.go
@@ -10,6 +10,8 @@ import (
 
 	"github.com/google/uuid"
 	"go.uber.org/zap"
+
+	"github.com/kandev/kandev/internal/db/dialect"
 )
 
 // migrateExecutorProfiles adds mcp_policy column and drops is_default from executor_profiles.
@@ -151,6 +153,10 @@ func (r *Repository) runMigrations() error {
 // the PRAGMA and the subsequent transaction use the same connection.
 // Returns true if the migration actually ran (gate fired), false if it was a no-op.
 func (r *Repository) recreateTable(tableName, triggerPhrase string, statements []string) (bool, error) {
+	if dialect.IsPostgres(r.db.DriverName()) {
+		return false, nil
+	}
+
 	var tableSql string
 	err := r.db.QueryRow(`SELECT sql FROM sqlite_master WHERE type='table' AND name=?`, tableName).Scan(&tableSql)
 	if errors.Is(err, sql.ErrNoRows) {
@@ -242,6 +248,10 @@ func (r *Repository) migrateTasksRemoveWorkflowFK() error {
 //
 // Idempotent: rows that already exist on either side are left untouched.
 func (r *Repository) backfillExecutorsRunningFromTaskSessions() error {
+	if dialect.IsPostgres(r.db.DriverName()) {
+		return nil
+	}
+
 	// Check whether task_sessions still has the column. If migration already ran,
 	// the column is gone and there's nothing to backfill.
 	var tableSql string
@@ -491,6 +501,10 @@ type backfillRow struct {
 // that have sessions but no environment, and links orphaned sessions.
 // Idempotent: tasks with existing environments are skipped.
 func (r *Repository) backfillTaskEnvironments() error {
+	if dialect.IsPostgres(r.db.DriverName()) {
+		return nil
+	}
+
 	orphaned, err := r.findOrphanedTasks()
 	if err != nil {
 		return err
@@ -523,11 +537,11 @@ func (r *Repository) backfillTaskEnvironments() error {
 func (r *Repository) findOrphanedTasks() ([]backfillRow, error) {
 	rows, err := r.db.Query(`
 		SELECT ts.task_id,
-		       COALESCE(ts.executor_id, ''),
-		       COALESCE(ts.executor_profile_id, ''),
-		       COALESCE(ts.repository_id, ''),
-		       COALESCE(er.container_id, ''),
-		       ts.started_at
+		       MIN(COALESCE(ts.executor_id, '')),
+		       MIN(COALESCE(ts.executor_profile_id, '')),
+		       MIN(COALESCE(ts.repository_id, '')),
+		       MIN(COALESCE(er.container_id, '')),
+		       MIN(ts.started_at)
 		FROM task_sessions ts
 		LEFT JOIN task_environments te ON te.task_id = ts.task_id
 		LEFT JOIN executors_running er ON er.session_id = ts.id
diff --git a/apps/backend/internal/task/repository/sqlite/base_schema.go b/apps/backend/internal/task/repository/sqlite/base_schema.go
index a8c3d32f4a..f0cc844199 100644
--- a/apps/backend/internal/task/repository/sqlite/base_schema.go
+++ b/apps/backend/internal/task/repository/sqlite/base_schema.go
@@ -5,6 +5,8 @@ import (
 	"fmt"
 
 	"github.com/google/uuid"
+
+	"github.com/kandev/kandev/internal/db/dialect"
 )
 
 // initSchema creates the database tables if they don't exist and applies
@@ -57,10 +59,19 @@ func (r *Repository) ensureWorkspaceIndexes() error {
 
 // ensureMessageMetadataIndexes creates indexes on JSON metadata fields for fast lookups.
 func (r *Repository) ensureMessageMetadataIndexes() error {
-	if _, err := r.db.Exec(`CREATE INDEX IF NOT EXISTS idx_messages_metadata_tool_call_id ON task_session_messages(task_session_id, json_extract(metadata, '$.tool_call_id'))`); err != nil {
+	driver := r.db.DriverName()
+	toolCallIndex := fmt.Sprintf(
+		`CREATE INDEX IF NOT EXISTS idx_messages_metadata_tool_call_id ON task_session_messages(task_session_id, (%s))`,
+		dialect.JSONExtract(driver, "metadata", "tool_call_id"),
+	)
+	if _, err := r.db.Exec(toolCallIndex); err != nil {
 		return err
 	}
-	if _, err := r.db.Exec(`CREATE INDEX IF NOT EXISTS idx_messages_metadata_pending_id ON task_session_messages(task_session_id, json_extract(metadata, '$.pending_id'))`); err != nil {
+	pendingIndex := fmt.Sprintf(
+		`CREATE INDEX IF NOT EXISTS idx_messages_metadata_pending_id ON task_session_messages(task_session_id, (%s))`,
+		dialect.JSONExtract(driver, "metadata", "pending_id"),
+	)
+	if _, err := r.db.Exec(pendingIndex); err != nil {
 		return err
 	}
 	return nil
@@ -238,21 +249,6 @@ func (r *Repository) initTaskSchema() error {
 		updated_at TIMESTAMP NOT NULL
 	);
 
-	CREATE TABLE IF NOT EXISTS task_repositories (
-		id TEXT PRIMARY KEY,
-		task_id TEXT NOT NULL,
-		repository_id TEXT NOT NULL,
-		base_branch TEXT DEFAULT '',
-		checkout_branch TEXT DEFAULT '',
-		position INTEGER DEFAULT 0,
-		metadata TEXT DEFAULT '{}',
-		created_at TIMESTAMP NOT NULL,
-		updated_at TIMESTAMP NOT NULL,
-		FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE,
-		FOREIGN KEY (repository_id) REFERENCES repositories(id) ON DELETE CASCADE,
-		UNIQUE(task_id, repository_id, base_branch, checkout_branch)
-	);
-
 	CREATE TABLE IF NOT EXISTS repositories (
 		id TEXT PRIMARY KEY,
 		workspace_id TEXT NOT NULL,
@@ -276,6 +272,21 @@ func (r *Repository) initTaskSchema() error {
 		FOREIGN KEY (workspace_id) REFERENCES workspaces(id) ON DELETE CASCADE
 	);
 
+	CREATE TABLE IF NOT EXISTS task_repositories (
+		id TEXT PRIMARY KEY,
+		task_id TEXT NOT NULL,
+		repository_id TEXT NOT NULL,
+		base_branch TEXT DEFAULT '',
+		checkout_branch TEXT DEFAULT '',
+		position INTEGER DEFAULT 0,
+		metadata TEXT DEFAULT '{}',
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL,
+		FOREIGN KEY (task_id) REFERENCES tasks(id) ON DELETE CASCADE,
+		FOREIGN KEY (repository_id) REFERENCES repositories(id) ON DELETE CASCADE,
+		UNIQUE(task_id, repository_id, base_branch, checkout_branch)
+	);
+
 	CREATE TABLE IF NOT EXISTS repository_scripts (
 		id TEXT PRIMARY KEY,
 		repository_id TEXT NOT NULL,
@@ -445,14 +456,30 @@ func (r *Repository) initDocumentsSchema() error {
 }
 
 func (r *Repository) initSessionSchema() error {
-	if err := r.initMessageTurnSchema(); err != nil {
+	if err := r.initSessionWorktreeSchema(); err != nil {
 		return err
 	}
-	return r.initSessionWorktreeSchema()
+	return r.initMessageTurnSchema()
 }
 
 func (r *Repository) initMessageTurnSchema() error {
 	_, err := r.db.Exec(`
+	CREATE TABLE IF NOT EXISTS task_session_turns (
+		id TEXT PRIMARY KEY,
+		task_session_id TEXT NOT NULL,
+		task_id TEXT NOT NULL,
+		started_at TIMESTAMP NOT NULL,
+		completed_at TIMESTAMP,
+		metadata TEXT DEFAULT '{}',
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL,
+		FOREIGN KEY (task_session_id) REFERENCES task_sessions(id) ON DELETE CASCADE
+	);
+
+	CREATE INDEX IF NOT EXISTS idx_turns_session_id ON task_session_turns(task_session_id);
+	CREATE INDEX IF NOT EXISTS idx_turns_session_started ON task_session_turns(task_session_id, started_at);
+	CREATE INDEX IF NOT EXISTS idx_turns_task_id ON task_session_turns(task_id);
+
 	CREATE TABLE IF NOT EXISTS task_session_messages (
 		id TEXT PRIMARY KEY,
 		task_session_id TEXT NOT NULL,
@@ -478,22 +505,6 @@ func (r *Repository) initMessageTurnSchema() error {
 	-- updated_at ADD COLUMN + backfill. Creating it here would fail on existing
 	-- DBs where CREATE TABLE IF NOT EXISTS is a no-op and the column does not
 	-- yet exist (schema init runs before migrations).
-
-	CREATE TABLE IF NOT EXISTS task_session_turns (
-		id TEXT PRIMARY KEY,
-		task_session_id TEXT NOT NULL,
-		task_id TEXT NOT NULL,
-		started_at TIMESTAMP NOT NULL,
-		completed_at TIMESTAMP,
-		metadata TEXT DEFAULT '{}',
-		created_at TIMESTAMP NOT NULL,
-		updated_at TIMESTAMP NOT NULL,
-		FOREIGN KEY (task_session_id) REFERENCES task_sessions(id) ON DELETE CASCADE
-	);
-
-	CREATE INDEX IF NOT EXISTS idx_turns_session_id ON task_session_turns(task_session_id);
-	CREATE INDEX IF NOT EXISTS idx_turns_session_started ON task_session_turns(task_session_id, started_at);
-	CREATE INDEX IF NOT EXISTS idx_turns_task_id ON task_session_turns(task_id);
 	`)
 	return err
 }
diff --git a/apps/backend/internal/task/repository/sqlite/postgres_schema_test.go b/apps/backend/internal/task/repository/sqlite/postgres_schema_test.go
new file mode 100644
index 0000000000..7bb08a5d3d
--- /dev/null
+++ b/apps/backend/internal/task/repository/sqlite/postgres_schema_test.go
@@ -0,0 +1,52 @@
+package sqlite
+
+import (
+	"testing"
+	"time"
+
+	"github.com/kandev/kandev/internal/testutil"
+)
+
+func TestPostgresFreshSchemaInitializes(t *testing.T) {
+	db := testutil.OpenIsolatedPostgres(t, testutil.PostgresDSNFromEnv(t))
+
+	if _, err := NewWithDB(db, db, nil); err != nil {
+		t.Fatalf("init fresh postgres schema: %v", err)
+	}
+}
+
+func TestPostgresSkipsLegacyTaskEnvironmentBackfill(t *testing.T) {
+	db := testutil.OpenIsolatedPostgres(t, testutil.PostgresDSNFromEnv(t))
+	repo, err := NewWithDB(db, db, nil)
+	if err != nil {
+		t.Fatalf("init fresh postgres schema: %v", err)
+	}
+
+	now := time.Now().UTC()
+	if _, err := db.Exec(db.Rebind(`
+		INSERT INTO tasks (id, title, created_at, updated_at)
+		VALUES (?, ?, ?, ?)
+	`), "task-orphaned", "Orphaned task", now, now); err != nil {
+		t.Fatalf("insert orphaned task: %v", err)
+	}
+	if _, err := db.Exec(db.Rebind(`
+		INSERT INTO task_sessions (id, task_id, state, started_at, updated_at)
+		VALUES (?, ?, ?, ?, ?)
+	`), "session-orphaned", "task-orphaned", "CREATED", now, now); err != nil {
+		t.Fatalf("insert orphaned session: %v", err)
+	}
+
+	if err := repo.backfillTaskEnvironments(); err != nil {
+		t.Fatalf("backfill task environments: %v", err)
+	}
+
+	var count int
+	if err := db.Get(&count, db.Rebind(`
+		SELECT COUNT(*) FROM task_environments WHERE task_id = ?
+	`), "task-orphaned"); err != nil {
+		t.Fatalf("count task environments: %v", err)
+	}
+	if count != 0 {
+		t.Fatalf("task environment count = %d, want 0", count)
+	}
+}
diff --git a/apps/backend/internal/task/repository/sqlite/task.go b/apps/backend/internal/task/repository/sqlite/task.go
index 4641188381..3ad383fdb5 100644
--- a/apps/backend/internal/task/repository/sqlite/task.go
+++ b/apps/backend/internal/task/repository/sqlite/task.go
@@ -59,6 +59,15 @@ func isFromOfficeProjection(alias string) string {
 	)`
 }
 
+func excludeConfigModePredicate(driver, col string) string {
+	if dialect.IsPostgres(driver) {
+		// Repository writes always marshal metadata as JSON; dirty Postgres rows
+		// with malformed JSON should fail loudly instead of being silently skipped.
+		return fmt.Sprintf("COALESCE(%s, '') NOT IN ('true', '1')", dialect.JSONExtract(driver, col, "config_mode"))
+	}
+	return fmt.Sprintf("%s IS NOT 1", dialect.JSONExtract(driver, col, "config_mode"))
+}
+
 // runnerProjection produces the correlated subquery (without alias) that
 // resolves the runner for the row of `tasks` with the given alias. Used
 // inline in SELECT projections.
@@ -411,7 +420,7 @@ func (r *Repository) ListTasksByWorkspace(ctx context.Context, workspaceID, work
 	}
 
 	if excludeConfig {
-		filter += " AND (metadata IS NULL OR json_extract(metadata, '$.config_mode') IS NOT 1)"
+		filter += " AND " + excludeConfigModePredicate(r.ro.DriverName(), "metadata")
 	}
 
 	var rows *sql.Rows
@@ -544,7 +553,7 @@ func (r *Repository) searchTasks(ctx context.Context, workspaceID, query, filter
 		tFilter += " AND t.archived_at IS NULL"
 	}
 	if excludeConfig {
-		tFilter += " AND (t.metadata IS NULL OR json_extract(t.metadata, '$.config_mode') IS NOT 1)"
+		tFilter += " AND " + excludeConfigModePredicate(r.ro.DriverName(), "t.metadata")
 	}
 
 	// Collect extra filter args in query-argument order
@@ -794,12 +803,12 @@ func (r *Repository) CountOpenWatcherCreatedTasks(ctx context.Context, metadataK
 	if !isSafeMetadataKey(metadataKey) {
 		return 0, fmt.Errorf("invalid watcher metadata key %q", metadataKey)
 	}
-	query := r.ro.Rebind(`
+	query := r.ro.Rebind(fmt.Sprintf(`
 		SELECT COUNT(*) FROM tasks
 		WHERE archived_at IS NULL
 			AND state NOT IN (?, ?, ?)
-			AND json_extract(metadata, '$.` + metadataKey + `') = ?
-	`)
+			AND %s = ?
+	`, dialect.JSONExtract(r.ro.DriverName(), "metadata", metadataKey)))
 	var n int
 	if err := r.ro.QueryRowxContext(ctx, query,
 		v1.TaskStateCompleted, v1.TaskStateFailed, v1.TaskStateCancelled, watchID,
diff --git a/apps/backend/internal/testutil/postgres.go b/apps/backend/internal/testutil/postgres.go
new file mode 100644
index 0000000000..3290484c15
--- /dev/null
+++ b/apps/backend/internal/testutil/postgres.go
@@ -0,0 +1,50 @@
+package testutil
+
+import (
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/jmoiron/sqlx"
+
+	_ "github.com/jackc/pgx/v5/stdlib"
+)
+
+// OpenIsolatedPostgres opens dsn with a unique schema on a single connection.
+// It lets package tests share one Postgres database without racing on
+// DROP SCHEMA public when Go runs packages in parallel.
+func OpenIsolatedPostgres(t testing.TB, dsn string) *sqlx.DB {
+	t.Helper()
+
+	schema := "kandev_test_" + strings.ReplaceAll(uuid.NewString(), "-", "")
+	db, err := sqlx.Open("pgx", dsn)
+	if err != nil {
+		t.Fatalf("open postgres: %v", err)
+	}
+	db.SetMaxOpenConns(1)
+	db.SetMaxIdleConns(1)
+
+	if _, err := db.Exec("CREATE SCHEMA " + schema); err != nil {
+		_ = db.Close()
+		t.Fatalf("create postgres schema %s: %v", schema, err)
+	}
+	t.Cleanup(func() {
+		_, _ = db.Exec("DROP SCHEMA IF EXISTS " + schema + " CASCADE")
+		_ = db.Close()
+	})
+
+	if _, err := db.Exec("SET search_path TO " + schema); err != nil {
+		t.Fatalf("set postgres search_path %s: %v", schema, err)
+	}
+	return db
+}
+
+func PostgresDSNFromEnv(t testing.TB) string {
+	t.Helper()
+	dsn := os.Getenv("KANDEV_TEST_POSTGRES_DSN")
+	if dsn == "" {
+		t.Skip("set KANDEV_TEST_POSTGRES_DSN to run Postgres tests")
+	}
+	return dsn
+}