diff --git a/.github/workflows/copyright_notice.yml b/.github/workflows/copyright_notice.yml
new file mode 100644
index 0000000..b6c398e
--- /dev/null
+++ b/.github/workflows/copyright_notice.yml
@@ -0,0 +1,36 @@
+name: Add copyright notice
+on:
+  pull_request:
+permissions:
+  contents: write
+jobs:
+  copyright_notice:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.ACTIONS_TOKEN }}
+          ref: ${{ github.head_ref }}
+      - uses: VinnyBabuManjaly/copyright-action@v1.0.0
+        with:
+          CopyrightString: '# Copyright (C) 2024 Manuel Bustillo\n\n'
+          FileType: '.rb'
+          Path: 'app/, config/, db/'
+      - uses: VinnyBabuManjaly/copyright-action@v1.0.0
+        with:
+          CopyrightString: '<%# Copyright (C) 2024 Manuel Bustillo %>\n\n'
+          FileType: '.erb'
+          Path: 'app/'
+      - name: Commit changes
+        run: |
+          git config --local user.email "bustikiller@bustikiller.com"
+          git config --local user.name "Manuel Bustillo"
+          git add .
+
+          if [ -n "$(git status --porcelain)" ]; then
+            echo "there are changes";
+            git commit -m "Add copyright notice"
+            git push
+          else
+            echo "no changes";
+          fi
diff --git a/COPYING.md b/COPYING.md
new file mode 100644
index 0000000..c6f01c6
--- /dev/null
+++ b/COPYING.md
@@ -0,0 +1,660 @@
+# GNU AFFERO GENERAL PUBLIC LICENSE
+
+Version 3, 19 November 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc.
+<https://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+## Preamble
+
+The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works. By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains
+free software for all its users.
+
+When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate. Many developers of free software are heartened and
+encouraged by the resulting cooperation. However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community. It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server. Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals. This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing
+under this license.
+
+The precise terms and conditions for copying, distribution and
+modification follow.
+
+## TERMS AND CONDITIONS
+
+### 0. Definitions.
+
+"This License" refers to version 3 of the GNU Affero General Public
+License.
+
+"Copyright" also means copyright-like laws that apply to other kinds
+of works, such as semiconductor masks.
+
+"The Program" refers to any copyrightable work licensed under this
+License. Each licensee is addressed as "you". "Licensees" and
+"recipients" may be individuals or organizations.
+
+To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of
+an exact copy. The resulting work is called a "modified version" of
+the earlier work or a work "based on" the earlier work.
+
+A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy. Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies. Mere interaction with a user
+through a computer network, with no transfer of a copy, is not
+conveying.
+
+An interactive user interface displays "Appropriate Legal Notices" to
+the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License. If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+### 1. Source Code.
+
+The "source code" for a work means the preferred form of the work for
+making modifications to it. "Object code" means any non-source form of
+a work.
+
+A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form. A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities. However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work. For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+The Corresponding Source need not include anything that users can
+regenerate automatically from other parts of the Corresponding Source.
+
+The Corresponding Source for a work in source code form is that same
+work.
+
+### 2. Basic Permissions.
+
+All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met. This License explicitly affirms your unlimited
+permission to run the unmodified Program. The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work. This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+You may make, run and propagate covered works that you do not convey,
+without conditions so long as your license otherwise remains in force.
+You may convey covered works to others for the sole purpose of having
+them make modifications exclusively for you, or provide you with
+facilities for running those works, provided that you comply with the
+terms of this License in conveying all material for which you do not
+control copyright. Those thus making or running the covered works for
+you must do so exclusively on your behalf, under your direction and
+control, on terms that prohibit them from making any copies of your
+copyrighted material outside their relationship with you.
+
+Conveying under any other circumstances is permitted solely under the
+conditions stated below. Sublicensing is not allowed; section 10 makes
+it unnecessary.
+
+### 3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such
+circumvention is effected by exercising rights under this License with
+respect to the covered work, and you disclaim any intention to limit
+operation or modification of the work as a means of enforcing, against
+the work's users, your or third parties' legal rights to forbid
+circumvention of technological measures.
+
+### 4. Conveying Verbatim Copies.
+
+You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+### 5. Conveying Modified Source Versions.
+
+You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these
+conditions:
+
+-   a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+-   b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under
+    section 7. This requirement modifies the requirement in section 4
+    to "keep intact all notices".
+-   c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy. This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged. This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+-   d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit. Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+### 6. Conveying Non-Source Forms.
+
+You may convey a covered work in object code form under the terms of
+sections 4 and 5, provided that you also convey the machine-readable
+Corresponding Source under the terms of this License, in one of these
+ways:
+
+-   a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+-   b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the Corresponding
+    Source from a network server at no charge.
+-   c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source. This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+-   d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge. You need not require recipients to copy the
+    Corresponding Source along with the object code. If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source. Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+-   e) Convey the object code using peer-to-peer transmission,
+    provided you inform other peers where the object code and
+    Corresponding Source of the work are being offered to the general
+    public at no charge under subsection 6d.
+
+A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal,
+family, or household purposes, or (2) anything designed or sold for
+incorporation into a dwelling. In determining whether a product is a
+consumer product, doubtful cases shall be resolved in favor of
+coverage. For a particular product received by a particular user,
+"normally used" refers to a typical or common use of that class of
+product, regardless of the status of the particular user or of the way
+in which the particular user actually uses, or expects or is expected
+to use, the product. A product is a consumer product regardless of
+whether the product has substantial commercial, industrial or
+non-consumer uses, unless such uses represent the only significant
+mode of use of the product.
+
+"Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to
+install and execute modified versions of a covered work in that User
+Product from a modified version of its Corresponding Source. The
+information must suffice to ensure that the continued functioning of
+the modified object code is in no case prevented or interfered with
+solely because modification has been made.
+
+If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information. But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or
+updates for a work that has been modified or installed by the
+recipient, or for the User Product in which it has been modified or
+installed. Access to a network may be denied when the modification
+itself materially and adversely affects the operation of the network
+or violates the rules and protocols for communication across the
+network.
+
+Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+### 7. Additional Terms.
+
+"Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law. If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it. (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.) You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders
+of that material) supplement the terms of this License with terms:
+
+-   a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+-   b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+-   c) Prohibiting misrepresentation of the origin of that material,
+    or requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+-   d) Limiting the use for publicity purposes of names of licensors
+    or authors of the material; or
+-   e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+-   f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions
+    of it) with contractual assumptions of liability to the recipient,
+    for any liability that these contractual assumptions directly
+    impose on those licensors and authors.
+
+All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10. If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term. If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions; the
+above requirements apply either way.
+
+### 8. Termination.
+
+You may not propagate or modify a covered work except as expressly
+provided under this License. Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+However, if you cease all violation of this License, then your license
+from a particular copyright holder is reinstated (a) provisionally,
+unless and until the copyright holder explicitly and finally
+terminates your license, and (b) permanently, if the copyright holder
+fails to notify you of the violation by some reasonable means prior to
+60 days after the cessation.
+
+Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License. If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+### 9. Acceptance Not Required for Having Copies.
+
+You are not required to accept this License in order to receive or run
+a copy of the Program. Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance. However,
+nothing other than this License grants you permission to propagate or
+modify any covered work. These actions infringe copyright if you do
+not accept this License. Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+### 10. Automatic Licensing of Downstream Recipients.
+
+Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License. You are not responsible
+for enforcing compliance by third parties with this License.
+
+An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations. If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License. For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+### 11. Patents.
+
+A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based. The
+work thus licensed is called the contributor's "contributor version".
+
+A contributor's "essential patent claims" are all patent claims owned
+or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version. For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement). To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients. "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+A patent license is "discriminatory" if it does not include within the
+scope of its coverage, prohibits the exercise of, or is conditioned on
+the non-exercise of one or more of the rights that are specifically
+granted under this License. You may not convey a covered work if you
+are a party to an arrangement with a third party that is in the
+business of distributing software, under which you make payment to the
+third party based on the extent of your activity of conveying the
+work, and under which the third party grants, to any of the parties
+who would receive the covered work from you, a discriminatory patent
+license (a) in connection with copies of the covered work conveyed by
+you (or copies made from those copies), or (b) primarily for and in
+connection with specific products or compilations that contain the
+covered work, unless you entered into that arrangement, or that patent
+license was granted, prior to 28 March 2007.
+
+Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+### 12. No Surrender of Others' Freedom.
+
+If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under
+this License and any other pertinent obligations, then as a
+consequence you may not convey it at all. For example, if you agree to
+terms that obligate you to collect a royalty for further conveying
+from those to whom you convey the Program, the only way you could
+satisfy both those terms and this License would be to refrain entirely
+from conveying the Program.
+
+### 13. Remote Network Interaction; Use with the GNU General Public License.
+
+Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your
+version supports such interaction) an opportunity to receive the
+Corresponding Source of your version by providing access to the
+Corresponding Source from a network server at no charge, through some
+standard or customary means of facilitating copying of software. This
+Corresponding Source shall include the Corresponding Source for any
+work covered by version 3 of the GNU General Public License that is
+incorporated pursuant to the following paragraph.
+
+Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+### 14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions
+of the GNU Affero General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever
+published by the Free Software Foundation.
+
+If the Program specifies that a proxy can decide which future versions
+of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+### 15. Disclaimer of Warranty.
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
+WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
+PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
+DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
+CORRECTION.
+
+### 16. Limitation of Liability.
+
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
+CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
+ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
+NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
+LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
+TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
+PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+### 17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS
+
+## How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these
+terms.
+
+To do so, attach the following notices to the program. It is safest to
+attach them to the start of each source file to most effectively state
+the exclusion of warranty; and each file should have at least the
+"copyright" line and a pointer to where the full notice is found.
+
+        <one line to give the program's name and a brief idea of what it does.>
+        Copyright (C) <year>  <name of author>
+
+        This program is free software: you can redistribute it and/or modify
+        it under the terms of the GNU Affero General Public License as
+        published by the Free Software Foundation, either version 3 of the
+        License, or (at your option) any later version.
+
+        This program is distributed in the hope that it will be useful,
+        but WITHOUT ANY WARRANTY; without even the implied warranty of
+        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+        GNU Affero General Public License for more details.
+
+        You should have received a copy of the GNU Affero General Public License
+        along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper
+mail.
+
+If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source. For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code. There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for
+the specific requirements.
+
+You should also get your employer (if you work as a programmer) or
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. For more information on this, and how to apply and follow
+the GNU AGPL, see <https://www.gnu.org/licenses/>.
diff --git a/app/channels/application_cable/channel.rb b/app/channels/application_cable/channel.rb
index d672697..3073f1e 100644
--- a/app/channels/application_cable/channel.rb
+++ b/app/channels/application_cable/channel.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module ApplicationCable
   class Channel < ActionCable::Channel::Base
   end
diff --git a/app/channels/application_cable/connection.rb b/app/channels/application_cable/connection.rb
index 0ff5442..1cc97c6 100644
--- a/app/channels/application_cable/connection.rb
+++ b/app/channels/application_cable/connection.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module ApplicationCable
   class Connection < ActionCable::Connection::Base
   end
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 7d14012..eda95cc 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class ApplicationController < ActionController::Base
     after_action :set_csrf_cookie
 
diff --git a/app/controllers/expenses_controller.rb b/app/controllers/expenses_controller.rb
index 2692f74..774b87f 100644
--- a/app/controllers/expenses_controller.rb
+++ b/app/controllers/expenses_controller.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class ExpensesController < ApplicationController
   before_action :set_expense, only: %i[ show edit update destroy ]
 
diff --git a/app/controllers/groups_controller.rb b/app/controllers/groups_controller.rb
index 0f489fb..232ac85 100644
--- a/app/controllers/groups_controller.rb
+++ b/app/controllers/groups_controller.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class GroupsController < ApplicationController
   def index
     roots = Group.where(parent_id: nil)
diff --git a/app/controllers/guests_controller.rb b/app/controllers/guests_controller.rb
index 6272dd9..5a1dbb2 100644
--- a/app/controllers/guests_controller.rb
+++ b/app/controllers/guests_controller.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 require 'csv'
 
 class GuestsController < ApplicationController
diff --git a/app/controllers/tables_arrangements_controller.rb b/app/controllers/tables_arrangements_controller.rb
index 7d3c371..8523f5a 100644
--- a/app/controllers/tables_arrangements_controller.rb
+++ b/app/controllers/tables_arrangements_controller.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class TablesArrangementsController < ApplicationController
   def index
     @tables_arrangements = TablesArrangement.all.order(discomfort: :asc).limit(10)
diff --git a/app/extensions/tree_node_extension.rb b/app/extensions/tree_node_extension.rb
index fe4f720..630b011 100644
--- a/app/extensions/tree_node_extension.rb
+++ b/app/extensions/tree_node_extension.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module TreeNodeExtension
   def distance_to_common_ancestor(another_node)
     return 0 if self == another_node
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index de6be79..5e869ad 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1,2 +1,4 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module ApplicationHelper
 end
diff --git a/app/helpers/expenses_helper.rb b/app/helpers/expenses_helper.rb
index 1d50062..af8a78e 100644
--- a/app/helpers/expenses_helper.rb
+++ b/app/helpers/expenses_helper.rb
@@ -1,2 +1,4 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module ExpensesHelper
 end
diff --git a/app/helpers/groups_helper.rb b/app/helpers/groups_helper.rb
index c091b2f..311c1a2 100644
--- a/app/helpers/groups_helper.rb
+++ b/app/helpers/groups_helper.rb
@@ -1,2 +1,4 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module GroupsHelper
 end
diff --git a/app/helpers/guests_helper.rb b/app/helpers/guests_helper.rb
index 00317bf..ca740f6 100644
--- a/app/helpers/guests_helper.rb
+++ b/app/helpers/guests_helper.rb
@@ -1,2 +1,4 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module GuestsHelper
 end
diff --git a/app/helpers/tables_arrangements_helper.rb b/app/helpers/tables_arrangements_helper.rb
index c066a2e..637e079 100644
--- a/app/helpers/tables_arrangements_helper.rb
+++ b/app/helpers/tables_arrangements_helper.rb
@@ -1,2 +1,4 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module TablesArrangementsHelper
 end
diff --git a/app/jobs/application_job.rb b/app/jobs/application_job.rb
index d394c3d..3498a49 100644
--- a/app/jobs/application_job.rb
+++ b/app/jobs/application_job.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class ApplicationJob < ActiveJob::Base
   # Automatically retry jobs that encountered a deadlock
   # retry_on ActiveRecord::Deadlocked
diff --git a/app/mailers/application_mailer.rb b/app/mailers/application_mailer.rb
index 3c34c81..94e1656 100644
--- a/app/mailers/application_mailer.rb
+++ b/app/mailers/application_mailer.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class ApplicationMailer < ActionMailer::Base
   default from: "from@example.com"
   layout "mailer"
diff --git a/app/models/application_record.rb b/app/models/application_record.rb
index b63caeb..e93781d 100644
--- a/app/models/application_record.rb
+++ b/app/models/application_record.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class ApplicationRecord < ActiveRecord::Base
   primary_abstract_class
 end
diff --git a/app/models/expense.rb b/app/models/expense.rb
index 15a9560..34e2e33 100644
--- a/app/models/expense.rb
+++ b/app/models/expense.rb
@@ -1,2 +1,4 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class Expense < ApplicationRecord
 end
diff --git a/app/models/group.rb b/app/models/group.rb
index afcadaa..4e12aed 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class Group < ApplicationRecord
   validates :name, uniqueness: true
   validates :name, :order, presence: true
diff --git a/app/models/guest.rb b/app/models/guest.rb
index 4e8bcce..412f01c 100644
--- a/app/models/guest.rb
+++ b/app/models/guest.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class Guest < ApplicationRecord
   acts_as_taggable_on :affinity_groups, :unbreakable_bonds
   belongs_to :group
diff --git a/app/models/seat.rb b/app/models/seat.rb
index e909587..8395b9c 100644
--- a/app/models/seat.rb
+++ b/app/models/seat.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class Seat < ApplicationRecord
   belongs_to :guest
   belongs_to :table_arrangement
diff --git a/app/models/tables_arrangement.rb b/app/models/tables_arrangement.rb
index 1be3ec3..c3c0797 100644
--- a/app/models/tables_arrangement.rb
+++ b/app/models/tables_arrangement.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class TablesArrangement < ApplicationRecord
   has_many :seats
 end
diff --git a/app/serializers/serializable_group.rb b/app/serializers/serializable_group.rb
index f832475..f7cc103 100644
--- a/app/serializers/serializable_group.rb
+++ b/app/serializers/serializable_group.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class SerializableGroup < JSONAPI::Serializable::Resource
   type 'group'
 
diff --git a/app/serializers/serializable_guest.rb b/app/serializers/serializable_guest.rb
index 647c106..b8d9347 100644
--- a/app/serializers/serializable_guest.rb
+++ b/app/serializers/serializable_guest.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class SerializableGuest < JSONAPI::Serializable::Resource
   type 'guest'
 
diff --git a/app/services/affinity_groups_hierarchy.rb b/app/services/affinity_groups_hierarchy.rb
index af6c62a..7c87ed9 100644
--- a/app/services/affinity_groups_hierarchy.rb
+++ b/app/services/affinity_groups_hierarchy.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class AffinityGroupsHierarchy < Array
   include Singleton
 
diff --git a/app/services/tables/discomfort_calculator.rb b/app/services/tables/discomfort_calculator.rb
index 69214bb..d6907e8 100644
--- a/app/services/tables/discomfort_calculator.rb
+++ b/app/services/tables/discomfort_calculator.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module Tables
   class DiscomfortCalculator
     private attr_reader :table
diff --git a/app/services/tables/distribution.rb b/app/services/tables/distribution.rb
index 33cb130..b361c70 100644
--- a/app/services/tables/distribution.rb
+++ b/app/services/tables/distribution.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 require_relative '../../extensions/tree_node_extension'
 
 module Tables
diff --git a/app/services/tables/swap.rb b/app/services/tables/swap.rb
index 631b49b..9668efb 100644
--- a/app/services/tables/swap.rb
+++ b/app/services/tables/swap.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module Tables
   class Swap
     private attr_reader :initial_solution
diff --git a/app/services/tables/table.rb b/app/services/tables/table.rb
index 1dde7f6..92b0f08 100644
--- a/app/services/tables/table.rb
+++ b/app/services/tables/table.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module Tables
   class Table < Array
     attr_accessor :discomfort
diff --git a/app/services/vns/engine.rb b/app/services/vns/engine.rb
index 5c260aa..00f2c80 100644
--- a/app/services/vns/engine.rb
+++ b/app/services/vns/engine.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 module VNS
   class Engine
     def target_function(&function)
diff --git a/app/views/expenses/_expense.html.erb b/app/views/expenses/_expense.html.erb
index 6581cb7..5bac9f6 100644
--- a/app/views/expenses/_expense.html.erb
+++ b/app/views/expenses/_expense.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <div id="<%= dom_id expense %>">
   <p>
     <strong>Name:</strong>
diff --git a/app/views/expenses/_form.html.erb b/app/views/expenses/_form.html.erb
index 543a3ef..8d9cd9c 100644
--- a/app/views/expenses/_form.html.erb
+++ b/app/views/expenses/_form.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <%= form_with(model: expense) do |form| %>
   <% if expense.errors.any? %>
     <div style="color: red">
diff --git a/app/views/expenses/edit.html.erb b/app/views/expenses/edit.html.erb
index 75bab6f..032aba0 100644
--- a/app/views/expenses/edit.html.erb
+++ b/app/views/expenses/edit.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <h1>Editing expense</h1>
 
 <%= render "form", expense: @expense %>
diff --git a/app/views/expenses/index.html.erb b/app/views/expenses/index.html.erb
index e63f662..6e4fd28 100644
--- a/app/views/expenses/index.html.erb
+++ b/app/views/expenses/index.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <p style="color: green"><%= notice %></p>
 
 <h1>Expenses</h1>
diff --git a/app/views/expenses/new.html.erb b/app/views/expenses/new.html.erb
index 17d6299..a7b9844 100644
--- a/app/views/expenses/new.html.erb
+++ b/app/views/expenses/new.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <h1>New expense</h1>
 
 <%= render "form", expense: @expense %>
diff --git a/app/views/expenses/show.html.erb b/app/views/expenses/show.html.erb
index 2262a0e..b2bec00 100644
--- a/app/views/expenses/show.html.erb
+++ b/app/views/expenses/show.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <p style="color: green"><%= notice %></p>
 
 <%= render @expense %>
diff --git a/app/views/guests/_form.html.erb b/app/views/guests/_form.html.erb
index eaea454..e2daaf5 100644
--- a/app/views/guests/_form.html.erb
+++ b/app/views/guests/_form.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <%= form_with(model: guest) do |form| %>
   <% if guest.errors.any? %>
     <div style="color: red">
diff --git a/app/views/guests/_guest.html.erb b/app/views/guests/_guest.html.erb
index dfd51e9..ed160f9 100644
--- a/app/views/guests/_guest.html.erb
+++ b/app/views/guests/_guest.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <div id="<%= dom_id guest %>">
   <p>
     <strong>First name:</strong>
diff --git a/app/views/guests/edit.html.erb b/app/views/guests/edit.html.erb
index a024444..d59a8e7 100644
--- a/app/views/guests/edit.html.erb
+++ b/app/views/guests/edit.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <h1>Editing guest</h1>
 
 <%= render "form", guest: @guest %>
diff --git a/app/views/guests/index.html.erb b/app/views/guests/index.html.erb
index d71cfa8..3ef84c4 100644
--- a/app/views/guests/index.html.erb
+++ b/app/views/guests/index.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <p style="color: green"><%= notice %></p>
 
 <h1>Guests</h1>
diff --git a/app/views/guests/new.html.erb b/app/views/guests/new.html.erb
index d05ae72..8405d09 100644
--- a/app/views/guests/new.html.erb
+++ b/app/views/guests/new.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <h1>New guest</h1>
 
 <%= render "form", guest: @guest %>
diff --git a/app/views/guests/show.html.erb b/app/views/guests/show.html.erb
index bcfad6e..6976007 100644
--- a/app/views/guests/show.html.erb
+++ b/app/views/guests/show.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <p style="color: green"><%= notice %></p>
 
 <%= render @guest %>
diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index d68b671..4c8aeb2 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <!DOCTYPE html>
 <html>
   <head>
diff --git a/app/views/layouts/mailer.html.erb b/app/views/layouts/mailer.html.erb
index 3aac900..ca6bd25 100644
--- a/app/views/layouts/mailer.html.erb
+++ b/app/views/layouts/mailer.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <!DOCTYPE html>
 <html>
   <head>
diff --git a/app/views/layouts/mailer.text.erb b/app/views/layouts/mailer.text.erb
index 37f0bdd..0b40d6b 100644
--- a/app/views/layouts/mailer.text.erb
+++ b/app/views/layouts/mailer.text.erb
@@ -1 +1,3 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <%= yield %>
diff --git a/app/views/tables_arrangements/index.html.erb b/app/views/tables_arrangements/index.html.erb
index 260e144..b24f7da 100644
--- a/app/views/tables_arrangements/index.html.erb
+++ b/app/views/tables_arrangements/index.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <h1>Tables arrangements</h1>
 
 <ol>
diff --git a/app/views/tables_arrangements/show.html.erb b/app/views/tables_arrangements/show.html.erb
index a2b9aae..cc90581 100644
--- a/app/views/tables_arrangements/show.html.erb
+++ b/app/views/tables_arrangements/show.html.erb
@@ -1,3 +1,5 @@
+<%# Copyright (C) 2024 Manuel Bustillo %>
+
 <h1>ID: <%= @tables_arrangement.id %></h1>
 
 <p>Discomfort: <%= @tables_arrangement.discomfort %></p>
diff --git a/config/application.rb b/config/application.rb
index e21736e..2c1fa72 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 require_relative 'boot'
 
 require 'rails'
diff --git a/config/boot.rb b/config/boot.rb
index 988a5dd..b7afb85 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
 
 require "bundler/setup" # Set up gems listed in the Gemfile.
diff --git a/config/environment.rb b/config/environment.rb
index cac5315..6cec499 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # Load the Rails application.
 require_relative "application"
 
diff --git a/config/environments/development.rb b/config/environments/development.rb
index f39246f..49b67a2 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 require "active_support/core_ext/integer/time"
 
 Rails.application.configure do
diff --git a/config/environments/production.rb b/config/environments/production.rb
index c39bd29..eb6e7fa 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 require "active_support/core_ext/integer/time"
 
 Rails.application.configure do
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 3ada93b..ef2b3a4 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 require "active_support/core_ext/integer/time"
 
 # The test environment is used exclusively to run your application's
diff --git a/config/importmap.rb b/config/importmap.rb
index 909dfc5..f84aa44 100644
--- a/config/importmap.rb
+++ b/config/importmap.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # Pin npm packages by running ./bin/importmap
 
 pin "application"
diff --git a/config/initializers/affinity_groups.rb b/config/initializers/affinity_groups.rb
index f52c1d4..1415e8d 100644
--- a/config/initializers/affinity_groups.rb
+++ b/config/initializers/affinity_groups.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 require_relative '../../app/services/affinity_groups_hierarchy'
 
 hierarchy = AffinityGroupsHierarchy.instance
diff --git a/config/initializers/assets.rb b/config/initializers/assets.rb
index 2eeef96..f67fe73 100644
--- a/config/initializers/assets.rb
+++ b/config/initializers/assets.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # Be sure to restart your server when you modify this file.
 
 # Version of your assets, change this if you want to expire all your assets.
diff --git a/config/initializers/content_security_policy.rb b/config/initializers/content_security_policy.rb
index b3076b3..9004631 100644
--- a/config/initializers/content_security_policy.rb
+++ b/config/initializers/content_security_policy.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # Be sure to restart your server when you modify this file.
 
 # Define an application-wide content security policy.
diff --git a/config/initializers/cors.rb b/config/initializers/cors.rb
index a908920..f4b450f 100644
--- a/config/initializers/cors.rb
+++ b/config/initializers/cors.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # config/initializers/cors.rb
 
 Rails.application.config.middleware.insert_before 0, Rack::Cors do
diff --git a/config/initializers/filter_parameter_logging.rb b/config/initializers/filter_parameter_logging.rb
index c2d89e2..b5bfef2 100644
--- a/config/initializers/filter_parameter_logging.rb
+++ b/config/initializers/filter_parameter_logging.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # Be sure to restart your server when you modify this file.
 
 # Configure parameters to be partially matched (e.g. passw matches password) and filtered from the log file.
diff --git a/config/initializers/inflections.rb b/config/initializers/inflections.rb
index 157a851..6633bb9 100644
--- a/config/initializers/inflections.rb
+++ b/config/initializers/inflections.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # Be sure to restart your server when you modify this file.
 
 # Add new inflection rules using the following format. Inflections
diff --git a/config/initializers/permissions_policy.rb b/config/initializers/permissions_policy.rb
index 7db3b95..57547a3 100644
--- a/config/initializers/permissions_policy.rb
+++ b/config/initializers/permissions_policy.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # Be sure to restart your server when you modify this file.
 
 # Define an application-wide HTTP permissions policy. For further
diff --git a/config/initializers/ruby_extensions.rb b/config/initializers/ruby_extensions.rb
index f25093d..e515905 100644
--- a/config/initializers/ruby_extensions.rb
+++ b/config/initializers/ruby_extensions.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class Numeric
   def to_currency
     Money.from_amount(self, "EUR").format
diff --git a/config/puma.rb b/config/puma.rb
index afa809b..0e947b4 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # This configuration file will be evaluated by Puma. The top-level methods that
 # are invoked here are part of Puma's configuration DSL. For more information
 # about methods provided by the DSL, see https://puma.io/puma/Puma/DSL.html.
diff --git a/config/routes.rb b/config/routes.rb
index d1697bc..d96c9c9 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 Rails.application.routes.draw do
   resources :groups, only: :index
   resources :guests do
diff --git a/db/migrate/20240711175425_create_expenses.rb b/db/migrate/20240711175425_create_expenses.rb
index 63d0f2b..cdac7d0 100644
--- a/db/migrate/20240711175425_create_expenses.rb
+++ b/db/migrate/20240711175425_create_expenses.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class CreateExpenses < ActiveRecord::Migration[7.1]
   def change
     create_enum :pricing_types, ["fixed", "per_person"]
diff --git a/db/migrate/20240711180753_create_guests.rb b/db/migrate/20240711180753_create_guests.rb
index 1280006..ca3f85b 100644
--- a/db/migrate/20240711180753_create_guests.rb
+++ b/db/migrate/20240711180753_create_guests.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class CreateGuests < ActiveRecord::Migration[7.1]
   def change
     create_table :guests, id: :uuid do |t|
diff --git a/db/migrate/20240711181626_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb b/db/migrate/20240711181626_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb
index 8b97ba6..803f800 100644
--- a/db/migrate/20240711181626_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181626_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 1)
diff --git a/db/migrate/20240711181627_add_missing_unique_indices.acts_as_taggable_on_engine.rb b/db/migrate/20240711181627_add_missing_unique_indices.acts_as_taggable_on_engine.rb
index ebd46fd..7fe34a2 100644
--- a/db/migrate/20240711181627_add_missing_unique_indices.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181627_add_missing_unique_indices.acts_as_taggable_on_engine.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 2)
diff --git a/db/migrate/20240711181628_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb b/db/migrate/20240711181628_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb
index d17afe8..a329d5d 100644
--- a/db/migrate/20240711181628_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181628_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 3)
diff --git a/db/migrate/20240711181629_add_missing_taggable_index.acts_as_taggable_on_engine.rb b/db/migrate/20240711181629_add_missing_taggable_index.acts_as_taggable_on_engine.rb
index 52f696b..4548054 100644
--- a/db/migrate/20240711181629_add_missing_taggable_index.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181629_add_missing_taggable_index.acts_as_taggable_on_engine.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 4)
diff --git a/db/migrate/20240711181630_change_collation_for_tag_names.acts_as_taggable_on_engine.rb b/db/migrate/20240711181630_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
index 47fd928..d0ff9c4 100644
--- a/db/migrate/20240711181630_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181630_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 5)
diff --git a/db/migrate/20240711181631_add_missing_indexes_on_taggings.acts_as_taggable_on_engine.rb b/db/migrate/20240711181631_add_missing_indexes_on_taggings.acts_as_taggable_on_engine.rb
index f5aaaf9..194dea4 100644
--- a/db/migrate/20240711181631_add_missing_indexes_on_taggings.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181631_add_missing_indexes_on_taggings.acts_as_taggable_on_engine.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 6)
diff --git a/db/migrate/20240711181632_add_tenant_to_taggings.acts_as_taggable_on_engine.rb b/db/migrate/20240711181632_add_tenant_to_taggings.acts_as_taggable_on_engine.rb
index b62b660..23cb9f8 100644
--- a/db/migrate/20240711181632_add_tenant_to_taggings.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181632_add_tenant_to_taggings.acts_as_taggable_on_engine.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 7)
diff --git a/db/migrate/20240724181756_create_tables_arrangements.rb b/db/migrate/20240724181756_create_tables_arrangements.rb
index c05f6dc..ac69487 100644
--- a/db/migrate/20240724181756_create_tables_arrangements.rb
+++ b/db/migrate/20240724181756_create_tables_arrangements.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class CreateTablesArrangements < ActiveRecord::Migration[7.1]
   def change
     create_table :tables_arrangements, id: :uuid do |t|
diff --git a/db/migrate/20240724181853_create_seats.rb b/db/migrate/20240724181853_create_seats.rb
index 74f5b7b..b28c9d0 100644
--- a/db/migrate/20240724181853_create_seats.rb
+++ b/db/migrate/20240724181853_create_seats.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class CreateSeats < ActiveRecord::Migration[7.1]
   def change
     create_table :seats, id: :uuid do |t|
diff --git a/db/migrate/20240811142121_create_groups.rb b/db/migrate/20240811142121_create_groups.rb
index 0246978..b21f067 100644
--- a/db/migrate/20240811142121_create_groups.rb
+++ b/db/migrate/20240811142121_create_groups.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class CreateGroups < ActiveRecord::Migration[7.1]
   def change
     create_table :groups, id: :uuid do |t|
diff --git a/db/migrate/20240811143801_add_parent_to_group.rb b/db/migrate/20240811143801_add_parent_to_group.rb
index 575af38..c8a3a14 100644
--- a/db/migrate/20240811143801_add_parent_to_group.rb
+++ b/db/migrate/20240811143801_add_parent_to_group.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class AddParentToGroup < ActiveRecord::Migration[7.1]
   def change
     add_reference :groups, :parent, type: :uuid, index: true, foreign_key: { to_table: :groups }
diff --git a/db/migrate/20240811154115_add_group_to_guest.rb b/db/migrate/20240811154115_add_group_to_guest.rb
index d4e2bd4..f1fcdaf 100644
--- a/db/migrate/20240811154115_add_group_to_guest.rb
+++ b/db/migrate/20240811154115_add_group_to_guest.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class AddGroupToGuest < ActiveRecord::Migration[7.1]
   def change
     add_reference :guests, :group, null: false, foreign_key: true, type: :uuid
diff --git a/db/migrate/20240811170021_add_status_to_guest.rb b/db/migrate/20240811170021_add_status_to_guest.rb
index cd7be5b..de51170 100644
--- a/db/migrate/20240811170021_add_status_to_guest.rb
+++ b/db/migrate/20240811170021_add_status_to_guest.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 class AddStatusToGuest < ActiveRecord::Migration[7.1]
   def change
     add_column :guests, :status, :integer, default: 0
diff --git a/db/schema.rb b/db/schema.rb
index c4145db..1c81149 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 # This file is auto-generated from the current state of the database. Instead
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.
diff --git a/db/seeds.rb b/db/seeds.rb
index 391d6e1..09d33f7 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -1,3 +1,5 @@
+# Copyright (C) 2024 Manuel Bustillo
+
 NUMBER_OF_GUESTS = 50
 
 TablesArrangement.delete_all