diff --git a/core/src/main/java/me/mastercapexd/auth/database/importing/ImportSource.java b/core/src/main/java/me/mastercapexd/auth/database/importing/ImportSource.java
new file mode 100644
index 00000000..3ec34775
--- /dev/null
+++ b/core/src/main/java/me/mastercapexd/auth/database/importing/ImportSource.java
@@ -0,0 +1,9 @@
+package me.mastercapexd.auth.database.importing;
+
+import com.j256.ormlite.stmt.QueryBuilder;
+
+public interface ImportSource {
+
+    QueryBuilder<PortableAccount, ?> sourceAccounts();
+
+}
diff --git a/core/src/main/java/me/mastercapexd/auth/database/importing/ImportStatistics.java b/core/src/main/java/me/mastercapexd/auth/database/importing/ImportStatistics.java
new file mode 100644
index 00000000..c2cc1948
--- /dev/null
+++ b/core/src/main/java/me/mastercapexd/auth/database/importing/ImportStatistics.java
@@ -0,0 +1,66 @@
+package me.mastercapexd.auth.database.importing;
+
+import java.util.Objects;
+
+public class ImportStatistics {
+
+    private int accounts;
+    private int linkAccounts;
+    private int invalidEntries;
+    private boolean failed;
+
+    public ImportStatistics() {
+    }
+
+    public ImportStatistics(int accounts, int linkAccounts, int invalidEntries, boolean failed) {
+        this.accounts = accounts;
+        this.linkAccounts = linkAccounts;
+        this.invalidEntries = invalidEntries;
+        this.failed = failed;
+    }
+
+    public boolean success() {
+        return !failed;
+    }
+
+    void fail() {
+        failed = true;
+    }
+
+    void accountAdded() {
+        accounts++;
+    }
+
+    void linkAccountAdded() {
+        linkAccounts++;
+    }
+
+    void invalidEntrySkipped() {
+        invalidEntries++;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+        ImportStatistics that = (ImportStatistics) o;
+        return accounts == that.accounts && linkAccounts == that.linkAccounts && invalidEntries == that.invalidEntries && failed == that.failed;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(accounts, linkAccounts, invalidEntries, failed);
+    }
+
+    @Override
+    public String toString() {
+        String state = success() ? "(SUCCESS)" : "(FAILED)";
+        return "-- Import statistics " + state + " --" + "\n" +
+                "Account: " + accounts + "\n" +
+                "Account links: " + linkAccounts + "\n" +
+                "Invalid entries: " + invalidEntries;
+    }
+
+}
diff --git a/core/src/main/java/me/mastercapexd/auth/database/importing/PortableAccount.java b/core/src/main/java/me/mastercapexd/auth/database/importing/PortableAccount.java
new file mode 100644
index 00000000..06166356
--- /dev/null
+++ b/core/src/main/java/me/mastercapexd/auth/database/importing/PortableAccount.java
@@ -0,0 +1,99 @@
+package me.mastercapexd.auth.database.importing;
+
+import java.util.Collection;
+import java.util.UUID;
+
+import com.bivashy.auth.api.crypto.CryptoProvider;
+
+public class PortableAccount {
+
+    private final String name;
+    private final UUID uniqueId;
+    private final CryptoProvider cryptoProvider;
+    private final String hashedPassword;
+    private final Collection<LinkAccount> linkAccounts;
+    private final AccountDetails details;
+
+    public PortableAccount(String name, UUID uniqueId, CryptoProvider cryptoProvider, String hashedPassword, Collection<LinkAccount> linkAccounts,
+                           AccountDetails details) {
+        this.name = name;
+        this.uniqueId = uniqueId;
+        this.cryptoProvider = cryptoProvider;
+        this.hashedPassword = hashedPassword;
+        this.linkAccounts = linkAccounts;
+        this.details = details;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public UUID getUniqueId() {
+        return uniqueId;
+    }
+
+    public CryptoProvider getCryptoProvider() {
+        return cryptoProvider;
+    }
+
+    public String getHashedPassword() {
+        return hashedPassword;
+    }
+
+    public Collection<LinkAccount> getLinkAccounts() {
+        return linkAccounts;
+    }
+
+    public AccountDetails getDetails() {
+        return details;
+    }
+
+    public enum LinkType {
+        VK, DISCORD, TELEGRAM, TOTP
+    }
+    public static final class AccountDetails {
+
+        private final long lastQuitTimestamp;
+        private final String lastIpAddress;
+        private final long lastSessionStartTimestamp;
+
+        public AccountDetails(long lastQuitTimestamp, String lastIpAddress, long lastSessionStartTimestamp) {
+            this.lastQuitTimestamp = lastQuitTimestamp;
+            this.lastIpAddress = lastIpAddress;
+            this.lastSessionStartTimestamp = lastSessionStartTimestamp;
+        }
+
+        public long getLastQuitTimestamp() {
+            return lastQuitTimestamp;
+        }
+
+        public String getLastIpAddress() {
+            return lastIpAddress;
+        }
+
+        public long getLastSessionStartTimestamp() {
+            return lastSessionStartTimestamp;
+        }
+
+    }
+    public static final class LinkAccount {
+
+        private final LinkType linkType;
+        private final String identificator;
+
+        public LinkAccount(LinkType linkType, String identificator) {
+            this.linkType = linkType;
+            this.identificator = identificator;
+        }
+
+        public LinkType getLinkType() {
+            return linkType;
+        }
+
+        public String getIdentificator() {
+            return identificator;
+        }
+
+    }
+
+}