diff --git a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/constraint/DuplicatedForeignKeys.java b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/constraint/DuplicatedForeignKeys.java
index b0f00bbc..02ef30b6 100644
--- a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/constraint/DuplicatedForeignKeys.java
+++ b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/constraint/DuplicatedForeignKeys.java
@@ -30,7 +30,7 @@
  * @since 0.13.1
  */
 @Immutable
-public class DuplicatedForeignKeys implements DbObject, TableNameAware, ConstraintsAware {
+public final class DuplicatedForeignKeys implements DbObject, TableNameAware, ConstraintsAware {
 
     private final List<ForeignKey> foreignKeys;
     private final List<String> foreignKeysNames;
@@ -49,7 +49,7 @@ private DuplicatedForeignKeys(@Nonnull final List<ForeignKey> foreignKeys) {
      */
     @Nonnull
     @Override
-    public final String getName() {
+    public String getName() {
         return String.join(",", foreignKeysNames);
     }
 
@@ -58,7 +58,7 @@ public final String getName() {
      */
     @Nonnull
     @Override
-    public final PgObjectType getObjectType() {
+    public PgObjectType getObjectType() {
         return PgObjectType.CONSTRAINT;
     }
 
@@ -95,7 +95,7 @@ public List<Constraint> getConstraints() {
      * {@inheritDoc}
      */
     @Override
-    public final boolean equals(final Object other) {
+    public boolean equals(final Object other) {
         if (this == other) {
             return true;
         }
@@ -112,7 +112,7 @@ public final boolean equals(final Object other) {
      * {@inheritDoc}
      */
     @Override
-    public final int hashCode() {
+    public int hashCode() {
         return Objects.hash(foreignKeys);
     }
 
diff --git a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/constraint/ForeignKey.java b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/constraint/ForeignKey.java
index 774598f2..aa142010 100644
--- a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/constraint/ForeignKey.java
+++ b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/constraint/ForeignKey.java
@@ -27,7 +27,7 @@
  * @see Constraint
  */
 @Immutable
-public class ForeignKey extends Constraint {
+public final class ForeignKey extends Constraint {
 
     private final List<Column> columnsInConstraint;
 
diff --git a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/context/PgContext.java b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/context/PgContext.java
index c649c594..a5bb5c17 100644
--- a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/context/PgContext.java
+++ b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/context/PgContext.java
@@ -14,13 +14,17 @@
 
 import java.util.Locale;
 import javax.annotation.Nonnull;
+import javax.annotation.concurrent.Immutable;
+import javax.annotation.concurrent.ThreadSafe;
 
 /**
  * Represents a context for running maintenance queries.
  *
  * @author Ivan Vakhrushev
  */
-public class PgContext {
+@Immutable
+@ThreadSafe
+public final class PgContext {
 
     /**
      * Default bloat percentage threshold.
diff --git a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/function/StoredFunction.java b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/function/StoredFunction.java
index 0ecd51c0..37947849 100644
--- a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/function/StoredFunction.java
+++ b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/function/StoredFunction.java
@@ -25,7 +25,7 @@
  * @since 0.7.0
  */
 @Immutable
-public class StoredFunction implements DbObject, Comparable<StoredFunction> {
+public final class StoredFunction implements DbObject, Comparable<StoredFunction> {
 
     private final String functionName;
     private final String functionSignature;
@@ -41,7 +41,7 @@ private StoredFunction(@Nonnull final String functionName, @Nonnull final String
      */
     @Nonnull
     @Override
-    public final String getName() {
+    public String getName() {
         return getFunctionName();
     }
 
@@ -50,7 +50,7 @@ public final String getName() {
      */
     @Nonnull
     @Override
-    public final PgObjectType getObjectType() {
+    public PgObjectType getObjectType() {
         return PgObjectType.FUNCTION;
     }
 
@@ -88,7 +88,7 @@ public String toString() {
      * {@inheritDoc}
      */
     @Override
-    public final boolean equals(final Object other) {
+    public boolean equals(final Object other) {
         if (this == other) {
             return true;
         }
@@ -106,7 +106,7 @@ public final boolean equals(final Object other) {
      * {@inheritDoc}
      */
     @Override
-    public final int hashCode() {
+    public int hashCode() {
         return Objects.hash(functionName, functionSignature);
     }
 
diff --git a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/index/DuplicatedIndexes.java b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/index/DuplicatedIndexes.java
index 9620945c..b78d95d1 100644
--- a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/index/DuplicatedIndexes.java
+++ b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/index/DuplicatedIndexes.java
@@ -31,7 +31,7 @@
  * @see TableNameAware
  */
 @Immutable
-public class DuplicatedIndexes implements DbObject, TableNameAware, IndexesAware {
+public final class DuplicatedIndexes implements DbObject, TableNameAware, IndexesAware {
 
     private static final Comparator<IndexWithSize> INDEX_WITH_SIZE_COMPARATOR =
         Comparator.comparing(IndexWithSize::getTableName)
@@ -61,7 +61,7 @@ private DuplicatedIndexes(@Nonnull final List<IndexWithSize> duplicatedIndexes)
      */
     @Nonnull
     @Override
-    public final String getName() {
+    public String getName() {
         return String.join(",", indexesNames);
     }
 
@@ -70,7 +70,7 @@ public final String getName() {
      */
     @Nonnull
     @Override
-    public final PgObjectType getObjectType() {
+    public PgObjectType getObjectType() {
         return PgObjectType.INDEX;
     }
 
@@ -124,7 +124,7 @@ public List<String> getIndexNames() {
      * {@inheritDoc}
      */
     @Override
-    public final boolean equals(final Object other) {
+    public boolean equals(final Object other) {
         if (this == other) {
             return true;
         }
@@ -141,7 +141,7 @@ public final boolean equals(final Object other) {
      * {@inheritDoc}
      */
     @Override
-    public final int hashCode() {
+    public int hashCode() {
         return Objects.hash(indexes);
     }
 
diff --git a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/index/IndexWithBloat.java b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/index/IndexWithBloat.java
index 43ccbee7..a3760f6d 100644
--- a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/index/IndexWithBloat.java
+++ b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/index/IndexWithBloat.java
@@ -22,7 +22,7 @@
  * @author Ivan Vakhrushev
  */
 @Immutable
-public class IndexWithBloat extends IndexWithSize implements BloatAware {
+public final class IndexWithBloat extends IndexWithSize implements BloatAware {
 
     private final long bloatSizeInBytes;
     private final double bloatPercentage;
diff --git a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/sequence/SequenceState.java b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/sequence/SequenceState.java
index 3db68d6d..07757a7d 100644
--- a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/sequence/SequenceState.java
+++ b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/sequence/SequenceState.java
@@ -27,7 +27,7 @@
  * @since 0.12.0
  */
 @Immutable
-public class SequenceState implements DbObject, SequenceNameAware {
+public final class SequenceState implements DbObject, SequenceNameAware {
 
     private final String sequenceName;
     private final String dataType;
@@ -84,7 +84,7 @@ public double getRemainingPercentage() {
      */
     @Nonnull
     @Override
-    public final String getName() {
+    public String getName() {
         return getSequenceName();
     }
 
@@ -93,7 +93,7 @@ public final String getName() {
      */
     @Nonnull
     @Override
-    public final PgObjectType getObjectType() {
+    public PgObjectType getObjectType() {
         return PgObjectType.SEQUENCE;
     }
 
@@ -101,7 +101,7 @@ public final PgObjectType getObjectType() {
      * {@inheritDoc}
      */
     @Override
-    public final boolean equals(final Object other) {
+    public boolean equals(final Object other) {
         if (this == other) {
             return true;
         }
@@ -118,7 +118,7 @@ public final boolean equals(final Object other) {
      * {@inheritDoc}
      */
     @Override
-    public final int hashCode() {
+    public int hashCode() {
         return Objects.hash(sequenceName);
     }
 
diff --git a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/Table.java b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/Table.java
index 35f4b6cb..ca6a14a5 100644
--- a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/Table.java
+++ b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/Table.java
@@ -24,7 +24,7 @@
  * @author Ivan Vakhrushev
  */
 @Immutable
-public class Table implements DbObject, TableSizeAware, Comparable<Table> {
+public final class Table implements DbObject, TableSizeAware, Comparable<Table> {
 
     private final String tableName;
     private final long tableSizeInBytes;
@@ -39,7 +39,7 @@ private Table(@Nonnull final String tableName, final long tableSizeInBytes) {
      */
     @Nonnull
     @Override
-    public final String getName() {
+    public String getName() {
         return getTableName();
     }
 
@@ -48,7 +48,7 @@ public final String getName() {
      */
     @Nonnull
     @Override
-    public final PgObjectType getObjectType() {
+    public PgObjectType getObjectType() {
         return PgObjectType.TABLE;
     }
 
@@ -75,7 +75,7 @@ public long getTableSizeInBytes() {
      * @return string representation of the internal fields of this class
      */
     @Nonnull
-    final String innerToString() {
+    String innerToString() {
         return "tableName='" + tableName + '\'' +
             ", tableSizeInBytes=" + tableSizeInBytes;
     }
@@ -93,7 +93,7 @@ public String toString() {
      * {@inheritDoc}
      */
     @Override
-    public final boolean equals(final Object other) {
+    public boolean equals(final Object other) {
         if (this == other) {
             return true;
         }
@@ -110,7 +110,7 @@ public final boolean equals(final Object other) {
      * {@inheritDoc}
      */
     @Override
-    public final int hashCode() {
+    public int hashCode() {
         return Objects.hash(tableName);
     }
 
diff --git a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/TableWithBloat.java b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/TableWithBloat.java
index b9d290ca..9b89177b 100644
--- a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/TableWithBloat.java
+++ b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/TableWithBloat.java
@@ -23,7 +23,7 @@
  * @author Ivan Vakhrushev
  */
 @Immutable
-public class TableWithBloat extends AbstractTableAware implements BloatAware, Comparable<TableWithBloat> {
+public final class TableWithBloat extends AbstractTableAware implements BloatAware, Comparable<TableWithBloat> {
 
     private final long bloatSizeInBytes;
     private final double bloatPercentage;
@@ -68,7 +68,7 @@ public String toString() {
      * {@inheritDoc}
      */
     @Override
-    public final boolean equals(final Object other) {
+    public boolean equals(final Object other) {
         if (this == other) {
             return true;
         }
@@ -85,7 +85,7 @@ public final boolean equals(final Object other) {
      * {@inheritDoc}
      */
     @Override
-    public final int hashCode() {
+    public int hashCode() {
         return Objects.hash(table);
     }
 
diff --git a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/TableWithMissingIndex.java b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/TableWithMissingIndex.java
index 8a85b244..7ca2dad1 100644
--- a/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/TableWithMissingIndex.java
+++ b/pg-index-health-model/src/main/java/io/github/mfvanek/pg/model/table/TableWithMissingIndex.java
@@ -22,7 +22,7 @@
  * @author Ivan Vakhrushev
  */
 @Immutable
-public class TableWithMissingIndex extends AbstractTableAware implements Comparable<TableWithMissingIndex> {
+public final class TableWithMissingIndex extends AbstractTableAware implements Comparable<TableWithMissingIndex> {
 
     /**
      * The number of sequential scans performed on the table.
@@ -79,7 +79,7 @@ public String toString() {
      * {@inheritDoc}
      */
     @Override
-    public final boolean equals(final Object other) {
+    public boolean equals(final Object other) {
         if (this == other) {
             return true;
         }
@@ -96,7 +96,7 @@ public final boolean equals(final Object other) {
      * {@inheritDoc}
      */
     @Override
-    public final int hashCode() {
+    public int hashCode() {
         return Objects.hash(table);
     }